Shows
Group ChatHappy Holidays | Group Chat News 983Group Chat News is back with the biggest stories of the week including more information on the "freeport" loophole story from the last pod, President Trump says anyone who disagrees with him will "never" be Fed Chairman, Telegram founder Pavel Durov says he will cover IVF costs for women under 37 who want to use his donated sperm, and has promised his offspring a share of his fortune, Saks Global doesn't rule out bankruptcy, the Honest company to halt DTC sales, shutter mobile app, Steven Spielberg refused to work with Ben Affleck because of pool fight on a family vacation, f...
2025-12-241h 05
MID-WEST FARM REPORT - MADISONFirst Generation Dairy Farmer Speaks And Farmer Fear Of RetirementWhile the buzz has largely been on the national scene with department cuts and program elimination, here in Wisconsin work is quietly ongoing to craft budget plans and programs. Ben Jarboe gets an update on one senator's perspective and objectives. Senator Brad Pfaff grew up in agriculture and was temporary Secretary of Agriculture at WDATCP. He explains to Jarboe what his targets are for agriculture policy and programs moving forward with big emphasis on rural healthcare and more domestic use of products.We've got a little bit of everything coming to Wisconsin weatherwise this week. Stu Muck bre...
2025-03-1750 min
Cool Stuff DailyLung Cancer Breath Test, Weird Wed - Old Cake Sold, Gross Mystery Beach Balls, Monkey Escape, 'Wicked' Mistake, and TDIH - Big Ben Chimes for the First TimeA breakthrough breath test could detect lung cancer in the early stages, plus Weird Wednesday has a 77-year-old cake piece sold at auction, gross mystery balls on Sydney's beaches that should be avoided, monkeys captured after escaping a research lab, and a 'Wicked' mistake. Also, on This Day in History, the original Big Ben chimes for the first time. Breakthrough breath test could detect lung cancer earlyUltrasensitive In2O3-Based Nanoflakes for Lung Cancer Diagnosis and the Sensing Mechanism Investigated by Operando Spectroscopy | ACS Sensors77-year-old slice of Queen Elizabeth II's wedding...
2024-11-1322 min
Dat is fussballDat is fussball — TrailerAls je niet genoeg kunt krijgen van het EK voetbal dan ben je hier aan het juiste adres. Tess Elst ontleedt samen met haar sidekick en analisten de winnende tactiek, snuift de sfeer op bij de Rode Duivels en bespreekt de grote én de kleine verhalen.
Stevige stellingen en discussies worden afgewisseld met odes aan het spel en vermakelijke anekdotes. De studio van Tess wordt dé leukste plek voor kenners en liefhebbers, want zoals Jean-Marie Pfaff ooit zei: "Dat is fussball".
2024-06-0400 minCool Stuff DailyThe Surprising Benefit to Fish Swimming in Schools, A Rare Medical Condition is Cured for the First Time & TDIH: The Man Who Walked Backwards Across the US (and why he did it)
Fish Swim in Schools for Stealth–as 100 Fish Make Less Noise Than an Individual Swimming Alone (Supplemental: https://iopscience.iop.org/article/10.1088/1748-3190/ad3a4e) World-first treatment at Staffordshire Children’s Hospital at Royal Stoke for teenager with rare condition Heroes, Heroines, and History: The Backward Walk Around the World (Supplemental 1: PLENNIE WINGO - Wired For Adventure, Supplemental 2: Ben Montgomery's 'Man Who Walked Backward' lets readers step into history) Learn more about your ad choices. Visit megaphone.fm/adchoices
Learn more about your ad choic...
2024-04-1521 min
Inform PerformanceJonas Dodoo - Coaching Return-to-Running (Head Coach & Founder Speedworks Training)Episode 132: Dr Andy McDonald chats to Jonas Dodoo the Head Coach & Founder Speedworks Training. Jonas developed as a coach through his passion for speed and power and was lucky enough to be under the tutelage of Master Coach Dan Pfaff for four years. Jonas has worked with many elite performers across a range of sports but with his main successors and main role within Track and Field. Jonas currently has an Elite Group of Sprinters based out of the National Institute at Loughborough and he is also currently Consulting at Premiership and Championship Football and Rugby clubs working with th...
2023-10-1940 min
Cool Stuff DailyTue. 02/07 - "Skutniks" at the State of the Union
How the State of the Union address has changed in its 233 years. Plus, the “extinct” versions of SARS CoV-2 that are still circulating among animals. And, donate to the San Antonio Zoo and they’ll name a cockroach after your ex. Sponsors: ZocDoc, zocdoc.com/coolstuff
Indeed, Indeed.com/goodnews
Links:
The State of the Union address's history, explained (Vox)
A Brief History of the State of the Union Address (Mental Floss)
Memorable moments from recent State of the Union addresses (ABC News)
Unanimous Verdict: Networks Chose Clinton (NY Times, 1997)
'Extinct' Coronaviruses Still Thrive in Nor...
2023-02-0719 min
7 Friday NightThe Bell Tolls For All (w/ Bellarmine RB, Ben Pfaff)It's CIF State Bowl Championship Week and the show kicks off its week-long coverage with a jam-packed episode looking back at a number of NorCal championship results.
Hosts Chace Bryson and Ben Enos offer up impressions and anecdotes from NorCal wins by Pittsburg, Grant-Sacramento and De La Salle-Concord. Then they pivot to 3-A NorCal Champion Bellarmine-San Jose and welcome a guest appearance from running back Ben Pfaff. The senior talks about the team's big win over Vanden-Fairfield, details his mid-season injury frustrations, and shares what has unlocked the team's full potential down the stretch.
Finally, Co...
2022-12-0653 min
Environment VariablesFrom Carbon Aware to Carbon IntelligentIn this episode of Environment Variables Chris Adams is joined by Colleen Josephson of VMWare, Philipp Wiesner of TU Berlin and Sara Bergman of Microsoft as they discuss the opportunities with making first carbon aware and then carbon intelligent computing. Variability, curtailment, disaggregation, 5G, 6G (!), delay-tolerant networks, intermittent computing, IoT and even a short segue about Raspberry Pi’s all make an appearance in this action-packed episode!Learn more about our guests:Chris Adams: LinkedIn / GitHub / WebsiteSara Bergman: LinkedIn / TwitterColleen Josephson: Twitter / WebsitePhilipp Wiesner: Twitter If you enjoyed this episode then please either:...
2022-08-0848 min
Through The Corporate Glass55. How Open Source Development can shape careersWhat role can open source play in career development? How does one contribute to and create new open source projects? How do you build a community around an open source project? We chat with Ben Pfaff, Principal Researcher at VMware Research to explore these questions. Ben is a systems researcher focusing on Software Define Networking.. He was one of the first employees at Nicira Networks in 2007 after completing his PhD at Stanford. There, he founded and led development of the Open vSwitch and OVN projects. He also contributed to the OpenFlow and P4 specifications. In January 2020, Ben joined the VMware...
2022-05-2323 min
OVS OrbitSneak Preview: VMware Research High Bits, with Lalith Suresh from VMware Research
VMware Research High Bits is a podcast coming soon from VMware's research
group. This episode is a sneak preview of episode 1, with Lalith Suresh.
Lalith is a researcher in the VMware Research Group who specializes in
measurement, design, and implementation of large-scale networked and
distributed systems. Last year, Lalith published a blog
entry with advice on how to build software systems for research, and
then he followed up with a video with more
details. This episode interviews Lalith to learn more about his approach
to building research systems.
To learn more about Lalith's work, visit his VMware
...
2021-07-1734 min
Corner Cast#17 - Let's play Guitar!Ben & Madison are joined by Tristan Pfaff to give their advice about, as a beginner, how to start playing guitar!
For more Corners Content, Click here to check out all of our platforms and give us a follow!
We want to hear from you! Message us on any of our social media accounts! What do you wanna hear us talk about?
2021-05-0736 min
Cool Stuff DailyTue. 05/04 - The Closest to a Real Lightsaber We'll Probably Get
The physics of jumping to hyperspace, Disney teases their retractable lightsaber, and more Star Wars Day updates. Plus, in real space news: China launched the first module of the Chinese Space Station into orbit last week. Sponsors: Our Opinions Are Correct, Subscribe on Apple Podcasts ouropinionsarecorrect.com
Mint Mobile, Get a new wireless plan for just $15 a month mintmobile.com/kottke
Links:
When You Jump to Hyperspace, Make Sure You Wear a Seatbelt (Wired)
China Launches First Module of New Space Station Into Orbit (Smithsonian Magazine)
China launches core module of new space station...
2021-05-0418 minCorner CastGraphic Designer Tristan PfaffBen & Madison talk to Graphic Designer and Corners member Tristan! He talks about where he went to school and what a graphic designer does day-to-day!
2021-04-0741 minOVS OrbitThe Systems Approach, with Bruce Davie, Larry Peterson, and Mark Twain
Bruce Davie and Larry Peterson are the authors of the Systems Approach series of
computer networking textbooks. Mark Twain has been called the greatest
humorist the United States has produced and the father of American
literature. This episode, the first collaboration among these celebrated
authors, incorporates elements of the works of both [1, 2].
For more information on the Systems Approach series, visit systemsapproach.org or follow
the series on substack as systemsapproach or
Twitter as and @SystemsAppr. On Twitter, you
can find Bruce as @_drbruced,
Larry as @_llpete, and Mark as
@MarkTwain.
Bruce and Larry were...
2021-04-0114 minOVS OrbitComputer Networks: A Systems Approach, with Bruce Davie and Larry Peterson
Bruce Davie and Larry Peterson talk about their Systems Approach series of
books on computer networking. These books began with the textbook Computer Networks: A
Systems Approach, published in 1996. After publishing the fifth
edition in 2011, they took their book "open source" by making the text
freely available on
Github under a Creative Common license. Now the original book is
part of a series that also includes "micro-books" on SDN and 5G, with
more books in preparation. In this episode, Bruce and Larry talk about
their motivations and future plans, including trying to rope your host
into writing a book...
2021-03-1638 minOVS OrbitThe OVSDB Query Optimizer and Key-Value Interface, with Dmitry Yusupov from NVIDIA
Dmitry Yusupov submitted a talk to the Open vSwitch 2020 Fall Conference
that we weren't able to fit into the schedule. This podcast, recorded in
December 2020, is based on the material that Dmitry presented in a video available on YouTube.
The slides for Dmitry's talk are also
available.
The abstract for this talk is:
OVSDB (management protocol RFC 7047) is a fundamental building block of
modern SDN architecture based on OVN/OVS. OVSDB is the key component
that is responsible for efficient scalability of large deployments,
such as 1000+ node Kubernetes clusters when CNI function is OVN based.
2021-02-2739 min
Cool Stuff DailyTue. 02/23 - The History (and Erasure) of Black Brewers
Beer culture is perceived as overwhelmingly white, but its history and its present is not. A historical look at the erasure of Black brewers. The impact of pandemic boredom on the economy. And a new app that will put David Attenborough in your living room to teach you about the prehistoric world. Sponsors: The Jordan Harbinger Show, jordanharbinger.com/subscribe Audible, audible.com/kottke or text kottke to 500-500 to start your 30-day free trial Links:
How the Whiteness of Beer Culture Erases Black Brewers (Eater)
The Boredom Economy (NY Times)
Museum Alive AR W...
2021-02-2318 min
Seeking Truth in NetworkingBen Pfaff | Creating Open vSwitchJoin co-hosts Derick and Brandon as they sit down with Ben Pfaff, one of the original and core contributors of Open vSwitch, the virtual network switch for Linux.
2021-01-1653 min
Against Nice PodcastGun Control Laws Can Kill: The Nikki Goeser interview Nikki Goeser is on the podcast today. She tells a story of loss more tragic than any person should have to face. It was more than 10 years ago in a bar in Nashville, Tennessee. Nikki Goeser and her husband Ben were doing their karaoke business on the side one evening. Then they saw him. Nikki had been stalked for some time by a strange man. It had been a concern. But to that point it had been managed. Yet there he was in the bar. And then...
2020-11-291h 01
Kinjaz: Movement In The ShadowsEnter the World of Kinjaz | THE EpisodeWelcome to the Kinjaz Podkast!!! Where we discuss dance, life and whatever the f*ck we want! We thank you so much for joining us on this podcast journey!In this episode we talk about how the podcast, "Movement in the Shadows" came to be. We tell the story about the "Souplantation Revelation," how Ben, Charlie and I(Mike) had lunch at Souplantation after a rehearsal talked about our love for podcasts and then all decided we needed to make it happen.We wanted a platform where people could talk freely and have unfiltered conversation abo...
2020-10-1449 minKinjaz: Movement In The ShadowsEnter the World of Kinjaz | THE EpisodeWelcome to the Kinjaz Podkast!!! Where we discuss dance, life and whatever the f*ck we want! We thank you so much for joining us on this podcast journey!In this episode we talk about how the podcast, "Movement in the Shadows" came to be. We tell the story about the "Souplantation Revelation," how Ben, Charlie and I(Mike) had lunch at Souplantation after a rehearsal talked about our love for podcasts and then all decided we needed to make it happen.We wanted a platform where people could talk freely and have unfiltered conversation abo...
2020-10-1449 min
The Locker Room Podcast - from DSS CoachingThe Jonas Dodoo Interview Part 1- Developing World Class SpeedQPR FC Sport Scientists Ross Bennett & Ben Smalley are joined by world-renowned sprint coach Jonas Dodoo internationally renowned sprint coach Jonas Dodoo (@EatSleepTrain_). Jonas is the Head Coach of Speed Works, has an MSc in Coaching Science and has studied and worked alongside Olympics coach Dan Pfaff. Jonas has also worked with Olympic long jump champion Greg Rutherford and consulted for teams such as Arsenal FC and Bath Rugby Club. You can follow Jonas on Twitter at @EatSleepTrain_ or at www.speedworks.training
The lads speak about Jonas' history and coaching experience, his sprinting philosophy and they g...
2020-07-211h 19
The Neuro Experience99: Building an Empire After Being in a Coma for Four Days | Chris "Drama" PfaffToday’s episode is with Chris “Drama” Pfaff. In 2009 at age 22, with no background in business or fashion, he launched a t-shirt and streetwear line, Young & Reckless, which has grown into a nationwide brand, with distribution in more than 3,000 Macy’s, Dillard’s and PacSun stores, celebrity endorsements from Puff Daddy and Justin Bieber, 43 employees, and $31 million in revenue last year. ."I fell off my skateboard and fractured my skull. I had a brain hemorrhage and I was in a coma for four days. There were no long-term effects but I was like, I don’t think this is what I should do...
2019-09-1440 minOVS OrbitNetwork Service Mesh, with Frederick Kautz and Nikolay Nikolaev
Frederick Kautz and Nikolay Nikolaev are developers on the Network Service Mesh project,
which provides additional networking features for Kubernetes above what
is available from Kubernetes CNI networking implementations.
OVS Orbit is produced by Ben Pfaff. The
intro music in this episode is Drive,
featuring cdk and DarrylJ, copyright 2013, 2016 by Alex. The bumper
music is Yeah Ant
featuring Wired Ant and Javolenus, copyright 2013 by Speck. The outro
music is Space
Bazooka featuring Doxen Zsigmond, copyright 2013 by Kirkoid. All
content is licensed under a Creative Commons Attribution 3.0
Unported (CC BY 3.0) license.
2019-09-0143 minOVS OrbitLong-Term Network Latency, with Nick Buraglio from ESnet
Nick Buraglio works in research and education and service provider
networking, currently at ESnet, the US
Department of Energy's science network, which links sites in the United States and western
Europe. In this podcast, he talks about the role of latency
monitoring in managing a network.
Nick defines the latency that he's talking about:
"When most people think of latency, they think of a ping round-trip time.
That's one useful data point, but we're talking about very low tolerance
and high accuracy latency. You have to have a cellular or GPS clock and
a very strong...
2019-07-2539 minOVS OrbitUser-Configurable Protocol Support for OVS, or Why Doesn't OVS Support P4?
There are several challenges toward making it easy for users to add
support for new protocols in OVS or, equivalently, adding P4 support to
OVS. This talk, given at the Dagstuhl seminar on programmable data
planes in April 2019, explains the reasons that OVS doesn't already have
these features, what's changing, and likely future directions. The talk
includes considerable discussion with the audience.
An early statement summarizes the message of the talk:
...I think that it's too hard to add support for new protocols and I
think users should be able to do that fairly easily. Currently...
2019-06-0350 minOVS OrbitThe Faucet Controller at SC18, with Brad Cowie and Richard Sanger from University of Waikato
Brad Cowie and Richard Sanger are members of the WAND Network Research Group at the University of Waikato, in Hamilton,
New Zealand. They are both associated with the Faucet project, which develops an open
source OpenFlow controller for enterprise networks.
The first part of this talk is an introduction to Faucet. The second
part talks about how Faucet became involved in SCinet at
SC18, the supercomputing
conference held annually in Dallas. The talk includes questions from the
audience.
You may wish to view Brad's slides
along with the episode.
For more information on...
2019-05-011h 05OVS OrbitThe Discrepancy of the Megaflow Cache in OVS, with Levente Csikor and Gabor Retvari from Budapest University of Technology and Economics
Levente Csikor and Gabor Retvari from the Budapest University of
Technology and Economics present their talk “The Discrepancy of the
Megaflow Cache in OVS” at the Open vSwitch Fall Conference in San Jose
in December 2018. A few days later, they visited me to have this
discussion for the podcast about their work. This episode is a discussion of their work and their results.
For a synopsis of Levente and Gabor's work, please visit the
OVS conference page. Slides
and video
of their ovscon talk are also available.
OVS Orbit is produced by Ben Pfaff. The
intr...
2019-04-0142 minOVS OrbitOVS Hardware Offload, with Simon Horman from Netronome
Simon Horman has been an Open vSwitch contributor and committer since
2010. He currently works for Netronome, where his Open vSwitch work
centers around hardware offload using the "tc" API
integrated into the Linux kernel. This API allows users of Open vSwitch
to transparently obtain better performance: when offload is enabled with
a compatible network card, Open vSwitch works the same way, but faster.
The conversation includes:
Categories of NICs with hardware offload
The architecture of Netronome NICs
How the offload API works
Handling state (such as connection tracking state) in hardware
offload
Limitations of hardware offload...
2019-03-0131 minOVS OrbitEncrypting OVN Tunnels with IPsec, with Qiuyu Xiao from UNC-Chapel Hill
Qiuyu Xiao is a Ph.D. student in the department of computer science at
the University of North Carolina at Chapel Hill. During the summer of
2018, he was an intern in the Open vSwitch team at VMware. This episode
is a talk that Qiuyu gave at the end of his internship, describing his
work on encrypted tunnels for OVN. The slides that accompanied the talk are available.
To learn more about Qiuyu's work, visit his
website, or contact him via email at qiuyu@cs.unc.edu or on Twitter as @QiuyuX.
OVS Orbit is produced...
2019-02-0154 minOVS OrbitIntroduction to OVSDB, Part 2
This episode, recorded in April 2018, was the third in a series of
internal VMware tech talks about Open vSwitch. This episode is
particularly about OVSDB, the Open vSwitch Database, and particularly
about OVSDB from the viewpoint of the client. It talks about the C
client library, including how it represents data, the usual way to work
with it, and how it interacts with the OVSDB server. It also covers how
the C client library supports preparing transactions to send to the
server.
Part of the talk dissects and explains an OVSDB JSON-RPC transaction
created by ovs-vsctl. You...
2019-01-0154 minOVS OrbitPersonalized Pseudonyms for Servers in the Cloud, with Qiuyu Xiao from UNC-Chapel Hill
Qiuyu Xiao is a PhD student studying computer science at the University
of North Carolina at Chapel Hill. This episode is a talk that Qiuyu gave
at VMware in May. It is based on the paper “Personalized Pseudonyms for
Servers in the Cloud,” by Qiuyu Xiao, Michael K. Reiter, and Yinqian
Zhangyinqian, originally published in 2017 at Proceedings on
Privacy Enhancing Technologies.
You may wish to follow along with Qiuyu's slides.
The paper's abstract is:
A considerable and growing fraction of servers, especially of web
servers, is hosted in compute clouds. In this paper we oppo...
2018-08-2940 minOVS OrbitGeneric Linux Debugging, with Ansis Atteka from VMware
Ansis Atteka is a developer on the Open vSwitch team at VMware. This
episode is a recording of a talk that Ansis gave at VMware in May. He
covers techniques for debugging on Linux, in particular how to trace
through processes using strace, trace-cmd, and
other tools.
You may want to follow along with Ansis's slides.
You can contact Ansis at aatteka@ovn.org.
OVS Orbit is produced by Ben Pfaff. The
intro music in this episode is Drive,
featuring cdk and DarrylJ, copyright 2013, 2016 by Alex. The bumper
music is Yeah Ant
featuring...
2018-08-2925 minOVS OrbitNetworking with OVS at DigitalOcean, with Matt Layher and Armando Migliaccio from DigitalOcean
Matt Layher and Armando Migliaccio are
engineers focusing on networking at DigitalOcean, a cloud service
provider. In April, Justin
Pettit and I sat down with them at DigitalOcean HQ in New York City.
This episode is our discussion, which ranges from how DO first began
using Open vSwitch, the DO approach to network control, to scale and
performance issues, upgrade strategy, and the Open vSwitch code that
DigitalOcean itself is working to contribute.
Previously, Matt gave a talk at Open vSwitch 2017
Fall Conference about the use of Go with Open vSwitch at
DigitalOcean.
OVS Orbit...
2018-08-1939 minOVS OrbitOko: Extending Open vSwitch with Stateful Filters, with Paul Chaignon from Orange Labs and Inria Nancy
Paul Chaignon is a grad student at Orange and Inria. In this episode,
Paul talks about Oko: Extending Open
vSwitch with Stateful Filters, a paper written with co-authors Kahina
Lazri, Jérôme François, Thibault Delmas, and Olivier Festor. Paul
presented this research at SOSR '18 in March
2018. The paper has the following abstract:
With the Software-Defined Networking paradigm, software switches
emerged as the new edge of datacenter networks. The widely adopted Open
vSwitch implements the OpenFlow forwarding model; its simple
match-action abstraction eases network management, while providing
enough flexibility to define complex forwarding pipelines. OpenFlow,
how...
2018-08-1723 minOVS OrbitIncremental Processing with ovn-controller, with Han Zhou from eBay
Han Zhou is an architect working on highly scalable and reliable SDN
solutions for eBay's cloud infrastructure. He is an active contributor
in OpenStack and OVS/OVN. Before eBay, he has been working in networking
area for more than 10 years in Cisco and Nokia.
In OVN, the ovn-controller daemon runs on each hypervisor.
It obtains logical flows from the OVN southbound database, transforms
them into "physical flows," and pushes the physical flows into
ovs-vswitchd over an OpenFlow connection. In the current
implementation, whenever any of the tables in the OVN southbound database
changed, the daemon would fully...
2018-05-2328 minOVS OrbitToward Leaner, Faster ovn-northd, with Leonid Ryzhyk from VMware Research Group
Leonid Ryzhyk is a senior researcher in the VMware Research Group. The
main theme of his work is applying formal methods to build better
operating systems and networks. Before joining VMware, Leonid received
his PhD from University of New South Wales and NICTA. Leonid has also
worked as a researcher at NICTA, as a postdoc at University of Toronto
and at Carnegie Mellon University, and as a researcher at Samsung
Research America.
In OVN, the ovn-northd daemon acts as an interface and a
translator between OVN's northbound and southbound databases. With the
existing implementation, any change in...
2018-05-2233 minOVS OrbitOpenFaaS, with Alex Ellis from VMware
Alex Ellis founded and leads the OpenFaaS project, which is an open
source implementation of a serverless
framework. This episode is an interview with Alex. We talk about
serverless functions and OpenFaaS, how OpenFaaS compares to other
serverless frameworks, how networking works in OpenFaaS, open source
communities, and other related topics. We also take on a couple of
questions asked by listeners on Twitter.
For more information about OpenFaaS, visit openfaas.com. To get in touch with
Alex, you can tweet to him as @alexellisuk.
OVS Orbit is produced by Ben Pfaff. The
intro music...
2018-05-1750 minOVS OrbitFlow Translation
This is the third in a series of Open vSwitch tech talks that we are
starting to run internally at VMware every week or two. This episode is
about flow translation, the process that OVS follows when a packet
arrives in the software switch that does not match any already
established entry in the OVS datapath cache (the megaflow cache).
The translation process has two goals. First, it figures out what to do
with the particular packet being processed Second, it determines what
class of packets similar to this packet can be treated the same way. The
...
2018-04-2952 minOVS OrbitIntroduction to OVSDB
This is the second in a series of Open vSwitch tech talks that we are
starting to run internally at VMware every week or two. This episode is
particularly about OVSDB, the Open vSwitch Database. It starts out with
material explaining why OVSDB exists at all, given that there is so much
other work in databases and in network configuration. Then it moves on
to what OVSDB is and its basic features, including the features that its
schemas support. It also discusses the basics of the OVSDB network
protocol. It concludes with several minutes of questions.
OVS...
2018-04-0753 minOVS OrbitRCU in Open vSwitch Userspace
This is the first in a series of Open vSwitch tech talks that we are
starting to run internally at VMware every week or two. This episode is
particularly about read-copy-update,
or RCU for short, which is a synchronization technique that allows reads
to be very cheap (almost free), with some memory cost. This talk covers
reasons why RCU can be preferred over other techniques, such as readers-writer
locks, and its relationship with lockless synchronization and
reference counts. It also covers some of the RCU API within OVS (and why
OVS has its own API instead of using liburcu).
2018-04-0737 minOVS OrbitTen Years of Open vSwitch Success and Failure
This is a talk that I gave at an internal VMware event called "Open
Source Day" in February. I prepared it as a kind of internal recognition
of the ACM SOSR conference awarding Open
vSwitch its Software Systems Award. It goes over a history of Open
vSwitch and the motivation behind it, factors that led to its success,
and some of the project's failures and mixed results.
The accompanying slides are available as PDF, although it is not necessary to
view them to follow along.
OVS Orbit is produced by Ben Pfaff. The
intro music...
2018-04-0738 minOVS OrbitEnterprise SDN, with Greg Ferro from Packet Pushers
Greg Ferro is one of the Packet Pushers, a host of much
more popular podcasts than this one. Greg's bio says:
Greg survived 25+ years of Enterprise IT as a network engineer, architect
and designer. Involved with a wide range of companies in gaming, online,
finance, carriers, energy and other, he was a team member or leader that
designed, built and deployed quite a few medium & large solutions for
well known large companies. He was CCIE#6920 (and a bunch of others) but
thats not relevant now.
The conversation in this episode focuses on the relationship between
virtual switching...
2018-03-0148 minOVS OrbitNetwork Stack as a Service, with Henry Xu from City University of Hong Kong
Henry Xu is an assistant
professor in the computer science
department at the City University
of Hong Kong, where he leads the NetX Lab. In this episode, we
discuss the research behind his group's recent paper Network Stack as a Service in
the Cloud, presented at HotNets
2017. The paper has the following abstract:
The tenant network stack is implemented inside the virtual machines in
today's public cloud. This legacy architecture presents a barrier to
protocol stack innovation due to the tight coupling between the network
stack and the guest OS. In particular, it causes many deployment
troubles to...
2018-02-1539 minOVS OrbitHardware Acceleration on NICs, with Andy Gospodarek from Broadcom
This episode features Andy Gospodarek, a Principal Engineer at Broadcom,
where he works as a software architect on the NICs team. This interview,
recorded at the DPDK summit in San Jose on November 15, 2017, focuses on
his team's work on offloading flows to Broadcom NICs, using the user's
choice of the Linux “TC” flow offload API or a Broadcom-specific API.
Toward the end, he also talks about a different kind of hardware
acceleration using a “Smart NIC” with a multicore general-purpose CPU
that can run Open vSwitch or other popular networking software.
Andy also spoke about acceleration with Smart NI...
2018-01-3133 minOVS OrbitOpen Compute Project Networking, with Andrew "Puck" Ruthven from Catalyst IT
Andrew Ruthven, aka “Puck”, is a Data Centre Manager at Catalyst IT, a New Zealand open
source specialist IT company whose services include operating an
OpenStack based public cloud.
This episode is based on “Open
Compute Project, down under”, a talk that Andrew gave at OpenStack
Sydney, which had the following abstract:
This talk will review the Open Compute Project, where it came from, where
things are now and where things are headed. We will cover benefits that
Open Compute Project hardware provide over the typical server hardware
that we’re used to. We will discuss how it wor...
2018-01-1129 minOVS OrbitWhat's New in OVN 2.8, with Ben Pfaff from VMware
This is a recording of a talk given by Ben Pfaff at the OpenStack Summit
in Sydney on Monday, Nov. 6, with the follow abstract:
The Open vSwitch (OVS) community recently released version 2.8. The
release includes updates to both OVS and OVN (Open Virtual Network),
which provides virtual networking for OVS. This presentation will
primarily focus on updates to OVN and how OpenStack can use it as a
backend for OpenStack Neutron. OVN has continued to grow and mature as an
OpenStack networking solution. Recent additions include HA for L3
gateways, native DNS support, ACL (security group) logging, and...
2017-12-1539 minOVS OrbitRouting a Production Enterprise Network with Faucet, with Brad Cowie from WAND
Brad Cowie is a member of the WAND Network Research Group at the University of Waikato, in Hamilton,
New Zealand. He is also a core member of the Faucet project which
develops an open source OpenFlow controller for enterprise networks,
which he uses to build production OpenFlow networks.
This episode is a recording of a talk
that Brad gave at the OpenStack Summit in
Sydney on Nov. 6, with the following abstract:
Within the WAND network research group at the University of Waikato, we
operate a 100% OpenFlow-controlled network for research/teaching/BYOD
traffic. The access/aggregation layer...
2017-11-3041 minOVS OrbitIn-band Network Telemetry, with Chang Kim from Barefoot Networks
Chang Kim is an engineer at Barefoot Networks, where he has
been intimately involved in the design of the P4 domain-specific language for controlling a
network data plane.
Whereas the control and management planes in a network system are
general-purpose software implemented on CPUs, the data plane in a
high-speed network is typically implemented in an ASIC dedicated to
packet forwarding. State-of-the-art switching ASICs can handle multiple
Tbps (and Gpps). Until recently, these ASICs were designed as
fixed-function devices: they implemented the specific protocols they
supported in a hardware description language such as Verilog. Now,
trends in...
2017-11-1638 minOVS OrbitFaucet and OpenFlow at Allied Telesis, with Tony Van der Peet
Tony van der Peet is Chief Architect at Allied Telesis. In this episode,
he speaks about using OpenFlow on Allied Telesis networking hardware for
enterprise SDN.
The Allied Telesis implementation of OpenFlow is based on Open vSwitch.
According to Tony:
“We've tried really from the word `go' to develop the
most generic OpenFlow switch that we can, and obviously Open vSwitch is a
very fully featured version of OpenFlow. The trick, then, is how to
integrate that with your hardware solution. The solution we've come up
with is to let Open vSwitch do what it does be...
2017-10-3127 minOVS OrbitCocoon-2, with Leonid Ryzhyk from VMware Research
Leonid
Ryzhyk is a senior researcher at VMware Research in Palo Alto. He
focuses on applying formal methods to improve operating systems and
networks.
This episodes discusses Cocoon-2, a system that
Leonid is building to automate the tedious tasks involved in SDN
programming. One problem that it aims to solve is incrementality, that
is, the need to avoid recomputing all of the state in an SDN system given
a small change to its configuration.
Numerous academic SDN programming languages exist. Many of these think
of the network in terms of an automaton. NetKAT is a...
2017-10-2429 min
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2017-10-0609 minOVS OrbitFuzzing Frameworks, with Bhargava Shastry from TU Berlin
Bhargava
Shastry is a Ph.D. student in the Chair
for Security in Telecommunications at Technical University
Berlin. Bhargava develops tools that enable early detection and
fixing of security vulnerabilities.
Among other topics, this episode discusses Bhargava's paper “Static
Exploration of Taint-Style Vulnerabilities Found by Fuzzing,” which
was presented at WOOT
'17, the Workshop on Offensive Technologies. The paper's abstract
is:
Taint-style vulnerabilities comprise a majority of fuzzer discovered
program faults. These vulnerabilities usually manifest as memory access
violations caused by tainted program input. Although fuzzers have
helped uncover a majority of taint-style vulnerabilities in soft...
2017-10-0335 minOVS OrbitFlowFuzz, with Nicholas Gray and Thomas Zinner from University of Würzburg
Nicholas Gray is a PhD student at the University of Würzburg, Germany,
where he also completed his Master's thesis in 2015. His research
interests include SDN/NFV architectures and their impact on network
security. Thomas Zinner received his Diploma and Ph.D degrees in
computer science from the University of Wurzburg, Germany, in 2007 and
2012, respectively. Nicholas is a member of the research group headed by
Thomas on “Next Generation Networks” at the Chair of Communication
Networks, University of Würzburg.
This episode is about FlowFuzz, a framework for fuzzing OpenFlow-enabled
software and hardware switches. It covers the materi...
2017-09-2235 minOVS OrbitDPDK Introduction, with Harry van Haaren and Dave Hunt from Intel
Dave and Harry are developers who work at Intel on DPDK, the Data Plane Development Kit, which is
a library for high-performance packet processing in userspace. This
episode is an introduction to DPDK, its history, status, and its future,
and how it relates to Open vSwitch and the DPDK datapath included in Open
vSwitch.
OVS Orbit is produced by Ben Pfaff. The
intro music in this episode is Drive,
featuring cdk and DarrylJ, copyright 2013, 2016 by Alex. The bumper
music is Yeah Ant
featuring Wired Ant and Javolenus, copyright 2013 by Speck. The outro
music is Space
Bazooka featuring...
2017-09-0148 minOVS OrbitOpenStack Cyborg, with Howard (Zhipeng) Huang from Huawei
Howard is an IT standards engineer at Huawei. He has been working on
open source for about 6 years and attended the early Open vSwitch
conferences, including the earliest one held at Cisco in 2014. In this
episode of OVS Orbit, Howard talks about the OpenStack Cyborg project in
OpenStack, which was formerly called Nomad. Howard is the “caretaking”
PTL for the project.
The Cyborg project supports all kinds of hardware acceleration for
OpenStack. It spans networking, storage, and other areas, primarily
because users tend to think of acceleration as a single bucket of
features. Acceleration features across these mult...
2017-08-2028 minOVS OrbitBigBug: Practical Concurrency Analysis for SDN, with Ahmed El-Hassany from ETH Zürich
Ahmed El-Hassany is a second-year Ph.D. student at ETH Zürich, who
researches ways to make networks more programmable and to verify the
correctness of programmable networks. I caught up with Ahmed at SOSR,
the Symposium on SDN Research, where he presented BigBug: Practical
Concurrency Analysis for SDN, a paper that he authored along with
Roman May, Laurent Vanbever, and Martin Vechev. The paper's abstract is:
By operating in highly asynchronous environments, SDN controllers often
suffer from bugs caused by concurrency violations. Unfortunately,
state-of-the-art concurrency analyzers for SDNs often report thousands
of true violations, limiting their e...
2017-08-0132 minOVS OrbitControl and Management Plane for IO Modules, with Fulvio Risso from Politecnico di Torino
Fulvio Risso is an associate professor at Politecnico di Torino in Turin,
Italy. His research is in the area of high-speed (10+ Gbps) packet
processing and especially in programmable networks. This interview was
prompted by Fulvio's presentation “A
Control and Management Plane for IO Modules” at the IO Visor Summit
held on Feb. 27 in Mountain View (see Quentin Monnet's excellent summary
of the summit for more information).
The episode begins with a few words about OSSN 2017, the
2nd International Workshop on Open-Source Software Networking, which
Fulvio co-chairs. The interview occurred long before the workshop, which
took place in earl...
2017-07-0948 minOVS OrbitNew Approach to OVN Datapath Performance, with Jun Xiao from CloudNetEngine
Jun Xiao is the founder and CTO of CloudNetEngine, which is focused on
innovating a next generation “engine” for cloud virtual networking. He
has over 15 years experience in VMware, Huawei, Lucent, Sun Microsystem,
and other companies. His system design experience ranges from low-level
device drivers and network stacks to middleware and distributed systems.
This episode is a talk that Jun gave at OpenStack Boston during the Open
vSwitch Open Source Day on May 10, with the following abstract:
Jun presents a new high-performance datapath for OVN. OVN has many
advantages than other virtual networking solutions given its grea...
2017-06-1230 minOVS OrbitBaker: Scaling OVN with Kubernetes API Server, with Han Zhou from eBay
Han Zhou is an architect working on highly scalable and reliable SDN
solutions for eBay's cloud infrastructure. He is an active contributor
in OpenStack and OVS/OVN. Before eBay, he has been working in networking
area for more than 10 years in Cisco and Nokia.
This episode is a talk that Han gave at OpenStack Boston during the Open
vSwitch Open Source Day on May 10, with the following abstract:
Han presents “Baker,” a new approach used by eBay to combine OVN with
Kubernetes API server to meet the scalability and availability goal in a
large scale production envi...
2017-06-1222 minOVS OrbitOVN Support for Multiple Gateways and IPv6, with Russell Bryant and Numan Siddique from Red Hat
Russell Bryant is a Senior Principal Software Engineer at Red Hat, Inc.
He was on the OpenStack Technical Committee from Fall 2012 until Fall
2016 and was elected to serve on the OpenStack Foundation Board of
Directors in 2015, 2016, and 2017. Russell has been contributing to the
development of OpenStack since the Fall of 2011. His most significant
contributions around OpenStack have been to Nova and most recently
Neutron and OVN. Russell is also a project committer for Open vSwitch
(OVS) and OVN.
Numan Siddique is a developer at Red Hat, Bangalore. He has around 12
years of software development experience. He has...
2017-06-1129 minOVS OrbitOpenStack Performance with OVS-DPDK for NFV and Connection Tracking, with Sugesh Chandran and Bhanuprakash Bodireddy from Intel
Sugesh Chandran is a network software engineer with Intel. His work is
primarily focused on accelerated software switching solutions in user
space running on Intel architecture. His contributions to Open vSwitch
with DPDK include tunneling acceleration and enabling hardware
acceleration. Before joining Intel, he has been involved in developing
features for Cisco and Procurve switching products.
Bhanuprakash is a software engineer at Intel Corporation focusing on
virtual switching solutions. Before joining Intel, he has been involved
in building telecom solutions for Asian mobile operators and had
significant contributions towards fast-path optimization in vEPC. He
also worked on...
2017-06-1150 minOVS OrbitLightning Talks, with Joe Stringer from VMware and Yusuke Tatsumi from Yahoo! JAPAN
This episode is a series of 3 lightning talks given at OpenStack Boston
during the Open vSwitch Open Source Day on May 10.
The first speaker is Joe Stringer, a developer at VMware who works on
Open vSwitch. The title of his talk, which starts at 1:03, is
“Deploying an OVS-based feature switch in 5 minutes or less.” It
consists of a demo showing how to quickly deploy the Faucet open source
OpenFlow controller as a drop-in replacement for a network switch. This
talk did not include slides, but you can watch a video recording of a
similar demo on youtube. For...
2017-05-2116 minOVS OrbitDeploying OVN on Windows with OpenStack and Kubernetes, with Alessandro Pilotti and Alin Balutoiu from Cloudbase Solutions
Alessandro is CTO of Cloudbase Solutions, a company focused on cloud
computing interoperability and the main contributor of all the OpenStack
Windows and Hyper-V components in Nova, Neutron, Cinder, Ceilometer and
Heat since the Folsom release. Alin is a developer at Cloudbase who
describes himself as an Open Source enthusiast and a passionate Python
developer at heart.
Slides for this talk are available in PDF
format.
This episode is a talk that Alessandro and Alin gave at OpenStack Boston
during the Open vSwitch Open Source Day on May 10, with the following
abstract:
Current...
2017-05-1530 minOVS OrbitNetBricks: Taking the V out of NFV, with A. Panda from Berkeley
Panda is a PhD candidate in the computer science department at the
University of California, Berkeley. In this episode, we discuss the
paper “NetBricks:
Taking the V out of NFV,” by Panda, Sangjin Han, Keon Jang, Melvin
Walls, Sylvia Ratnasamy, and Scott Shenker, which was published in OSDI 2016. The
abstract for the paper is:
The move from hardware middleboxes to software network functions, as
advocated by NFV, has proven more challenging than expected. Developing
new NFs remains a tedious process, requiring that developers repeatedly
rediscover and reapply the same set of optimizations, while current
techniques for providing isolation betw...
2017-05-1445 minOVS OrbitNEAt: Network Error Auto-Correct, with Bingzhe Liu
Bingzhe Liu is a first-year PhD student at University of Illinois at
Urbana-Champaign. In this episode, we discuss the paper “NEAt:
Network Error Auto-Correct,” by Wenxuan Zhou, Jason Croft, Bingzhe
Liu, and Matthew Caesar, which Bingzhe presented on April 4 at SOSR,
the Symposium on SDN Research. The abstract for this paper is:
Configuring and maintaining an enterprise network is a challenging and
error-prone process. Administrators must often consider security
policies from a variety of sources simultaneously, including regulatory
requirements, industry standards, and to mitigate attack vectors.
Erroneous implementation of a policy, however, can result in costly
data brea...
2017-05-0121 minOVS OrbitDevPulseCon, with Rupa Dachere from VMware
This episode's guest is Rupa Dachere, an engineer at VMware and the
executive director and founder of CodeChix, a 501(c)3 charity dedicated to
education, advocacy and mentoring of women engineers in industry and
academia. Rupa founded CodeChix because she found that, regardless of
where she worked in the computer industry, she was the only woman on the
team, which led to difficulties in advancing and keeping up with
technologies that continue to pop up. The organization started out with
small group meetings at Rupa's house, grew slowly through meetups and
regular meetings, and now boasts over 400 women engineers as...
2017-04-0734 minOVS OrbitOVSDB Configuration for Hardware VTEPs, with Chandra Appanna from Arista and Bruce Davie from VMware
This episode's guests are Bruce Davie, a vice president CTO for APJ at
VMware, and Chandra Appanna, an engineer and manager at Arista, who are
two of the designers of the Open vSwitch database schema that can be used
to control VXLAN forwarding in top-of-rack switches, often called the
OVSDB VTEP schema.
The discussion in this episode is related to “A
Database Approach to SDN Control Plane Design,” by Bruce Davie and
several others, published in the January 2017 issue of SIGCOMM Computer Communications
Review, with the following abstract:
Software-defined networking (SDN) is a well-known example of a re...
2017-03-3150 minOVS OrbitDragonFlow, with Omer Anson from Huawei
Omer Anson is a software developer at Huawei. I caught up with him at
OpenStack Barcelona back in October to talk about the Dragonflow project,
which is a distributed SDN controller for OpenStack Neutron that supports
logical switching and routing and more advanced features.
According to Omer, Dragonflow distinguishes itself from other Neutron
drivers by aiming at scale. It intends to scale to thousands or even
tens of thousands of compute nodes (hypervisors). It also focuses on
scale testing, testing in simulation with 4,000 nodes with very good
results, showing a slowdown of only about 5% between 30 nodes and 4,000
...
2017-03-1629 minOVS OrbitThe Evolution of OpenFlow, with Jean Tourrilhes from HPE Labs and Justin Pettit from VMware
Jean Tourrilhes is a networking researcher at HPE Labs who served as the
chair of the Open Networking Foundation's OpenFlow standardization
working group (the “extensibility” working group) from its inception
until 2015. Justin Pettit, who was a founding employee at Nicira and who
has continued to work at VMware since it acquired Nicira in 2012, was
co-chair of the working group during the same period.
Justin and Jean are two of the authors of “SDN
and Standards Evolution: a Standards Perspective,” a paper published
in IEEE Computer in Nov. 2014. This paper gives a lot of the facts
behind the OpenFlow...
2017-03-0253 minOVS OrbitTrumpet: Timely and Precise Triggers in Data Center Networks, with Minlan Yu from Yale
Minlan Yu is an
associate professor of computer science at Yale and before that at USC.
She works in several areas that are relevant to Open vSwitch, including
network virtualization and software-defined networking, enterprise and
data center networks, and distributed systems.
We begin by talking about ACM
SIGCOMM 2017 1st International Workshop on Hot Topics in Container
Networking and Networked Systems, which Minlan is co-chairing.
“HotConNet” is a new workshop at SIGCOMM this year focusing on
networking for containers, which is far from a mature field. The
workshop is accepting 6-page papers until March 24. Workshop papers will
be pres...
2017-02-1636 minOVS OrbitSoftware Synthesis for Networks, with Nate Foster from Cornell
Nate Foster is an Associate Professor of Computer Science at Cornell
University and a Visiting Researcher at Barefoot Networks. The goal of
his research is developing programming languages and tools for building
reliable systems. He received a PhD in Computer Science from the
University of Pennsylvania in 2009, an MPhil in History and Philosophy of
Science from Cambridge University in 2008, and a BA in Computer Science
from Williams College in 2001. His awards include a Sloan Research
Fellowship, an NSF CAREER Award, a Most Influential POPL Paper Award, a
Tien ’72 Teaching Award, a Google Research Award, a Yahoo! Academic
Career Enhancement Aw...
2017-01-291h 00OVS OrbitThe IO Visor Project, with Brenden Blanco from VMware
Brenden Blanco is one of the most prolific developers working on the IO Visor Project, a Linux Foundation
Collaborative Project. Brenden was an employee at PLUMgrid, the startup behind IO
Visor, until it was acquired by VMware.
The interview begins with a history of the layers that stacked up to form
IO Visor. The history begins with the publication of The
BSD Packet Filter: A New Architecture for User-Level Packet Capture
at the 1993 Winter USENIX Conference, in January 1993. This paper
introduced BPF, short for Berkeley Packet Filter, for selecting packets
to be copied to userspace for analysis...
2017-01-1647 minOVS OrbitBenefits of Intent Based Interfaces to IT Infrastructure and Design Problems for Deploying at Scale, with Dave Lenrow from Huawei
This episode is a recording of a talk that Dave Lenrow gave at the Stanford
Platform Lab Fall Seminar on Dec. 6. Dave is Chief Architect for
Next Generation Data Center and Distinguished Engineer at Huawei. He
participates in a wide variety of open source networking projects
including ONOS, Open Daylight, OPNFV, opensourcesdn.org, and Open-O. He
is Chairman of the ONF North Bound Interface (NBI) WG, and a leader in
the OSSDN Boulder open source intent reference software project. He has
spent more than 20 years driving innovation in digital technology with an
emphasis on networks, storage and media.
2016-12-241h 00OVS OrbitContainer Integration with OVS, with Gurucharan Shetty from VMware
Guru Shetty has been working at VMware, and before that at Nicira, since
about 2011. Guru has done a lot of work to integrate Open vSwitch with
various platforms. This episode is a conversation with Guru primarily
about integrating Open vSwitch and OVN with multiple container systems,
including Docker and Kubernetes.
Guru begins by reiterating the rationale for containers from an
application developer point of view: to capture and encapsulate
dependencies into usable pieces and thereby make the software easier to
consume. This is not so different from a VM, conceptually, but
containers have some advantages in terms...
2016-12-1344 minOVS OrbitProtocol-Independent FIB Architecture, with Ryo Nakamura from University of Tokyo
Ryo Nakamura is a PhD
student at The University of Tokyo, studying IP networking, overlay
networking, and network operation. This episode is a recording I made of
his talk during APSys 2016, the
Asia-Pacific Workshop on Systems, on Aug. 5, based on Protocol-Independent FIB
Architecture for Network Overlays, written with co-authors Yohei Kuga
(from Keio University), Yuji Sekiya, and Hiroshi Esaki.
The abstract for this paper says:
We introduce a new forwarding information base architecture into the
stacked layering model for network overlays. In recent data center
networks, network overlay built upon tunneling protocols becomes an
essential technology...
2016-11-2924 minOVS OrbitThe Faucet SDN Controller, with Josh Bailey from Google and Shivaram Mysore from ONF
Faucet is an open source SDN controller developed by a community that
includes engineers at Google's New Zealand office, the Open Networking
Foundation (ONF), and others. This episode is an interview with Josh Bailey
from Google and Shivaram Mysore from the ONF. It was recorded on Nov. 7,
at Open vSwitch 2016
Fall Conference.
The episode begins with a description of Faucet's goals. Unlike the
higher profile Open Daylight
and ONOS controllers, which focus
on performance at high scale, Faucet places simplicity, ease of
development, and small code size as higher purposes.
Also in contrast to most...
2016-11-1346 minOVS OrbitOVN Launch, with Russell Bryant from Red Hat
OVN is a network virtualization system that has been under development as
part of the Open vSwitch project over about the last two years. On this
podcast, Ben Pfaff and Russell Bryant, two major contributors to OVN,
describe OVN, its architecture, its features, focusing on features that
were added in the recent release of Open vSwitch 2.6, and some future
directions.
This episode is based on the material presented at the OpenStack Summit
in the session titled “OVN - Moving to Production.” The
summit talk was recorded and video
and slides
are available. This podcast follows the structure of t...
2016-10-2935 minOVS OrbitDebugging OpenStack Problems using a State Graph Approach, with Yong Xiang from Tsinghua University
Yong Xiang is a PhD student at Tsinghua University. This episode is a
recording of his talk during APSys 2016, the
Asia-Pacific Workshop on Systems, on Aug. 5, based on Debugging OpenStack
Problems Using a State Graph Approach, written with co-authors Hu Li,
Sen Wang, Charley Peter Chen, and Wei Xu, which was awarded “best
paper” at the conference. A preprint of the paper is also available at arxiv.org.
Slides
from the talk are available. It is probably easier to follow the talk if
you have the slides available, but it is certainly not necessary.
This is a...
2016-10-1319 minOVS OrbitTunneling and Encapsulation, with Jesse Gross from VMware
Tunneling and encapsulation, with protocols from GRE to Geneve, have been
a key part of Open vSwitch since the early days. Jesse Gross, an early
employee at Nicira and major contributor to Open vSwitch, and perhaps
most importantly the maintainer of the Open vSwitch kernel module, joins
this episode of the podcast to talk about this aspect of OVS.
The conversation begins with a discussion of the reasons for L2-in-L3
tunnels. Jesse's reasons for such tunnels include adding a layer of
indirection between physical and virtual networks. VLANs can provide a
solution for partitioning networks, but...
2016-09-2634 minOVS OrbitLagopus, with Yoshihiro Nakajima from NTT
Lagopus is a high-performance, open
source software switch, primarily for DPDK on Linux, developed at NTT in
its Network Innovation Laboratories research group. Lagopus features
OpenFlow 1.3 conformance, plus extensions to better support NTT's use
cases. This episode is a discussion with Yoshihiro Nakajima, one of the
switch's developers, about Lagopus, its history, goals, and future.
Lagopus supports protocols that are particularly important to carriers,
such as PBB
and MPLS,
and includes OpenFlow extensions for general-purpose tunnel support with
VXLAN, GRE, and other encapsulations. Yoshihiro talks about how, with
DPDK, Lagopus implements some protocols, such as ARP and...
2016-09-1026 minOVS OrbitConverging Approaches to Software Switches
On Aug. 4 and 5, I attended APSys 2016, the
Asia-Pacific Workshop on Systems. This episode is my own “industry
talk” from APSys, titled “Converging Approaches in Software Switches:
Combining code- and data-driven approaches to achieve a better result.”
Slides
from the talk are available and may provide a little extra insight, but
it is not necessary to view them to follow along with with the talk.
This talk introduces the idea that software switches can be broadly
divided in terms of their architecture into two categories:
“code-driven” switches that call a series of arbitrary functions on
each packet, and “data-driven” s...
2016-08-2828 minOVS OrbitTime Capsule, with Jia Rao and Kun Suo from University of Texas at Arlington
On Aug. 4 and 5, I attended APSys 2016, the
Asia-Pacific Workshop on Systems. I was impressed with how many of the
papers presented there were relevant to Open vSwitch and virtualization
in general. This episode is an interview with Jia Rao and Kun (Tony) Suo
of the University of Texas at Arlington, to talk about their APSys paper,
Time Capsule:
Tracing Packet Latency across Different Layers in Virtualized
Systems, which received the conference's Best Paper award.
The paper's abstract is:
Latency monitoring is important for improving user experience and
guaranteeing quality-of-service (QoS). Virtualized systems, which have
complex I...
2016-08-2030 minOVS OrbitOpen vSwitch Joins Linux Foundation
On August 9, Open
vSwitch joined the Linux Foundation as a Linux Foundation
Collaborative Project, as previously
discussed on ovs-discuss.
This episode is a recording of a conference call held by the Open vSwitch
developers on August 10 to talk about this move, what will change and
what will not change as a result, and open up for Q&A. Justin Pettit
and Ben Pfaff are the main speakers in the call. You will also hear
comments and questions from Simon Horman from Netronome and Mike Dolan
from the Linux Foundation.
OVS Orbit is produced by Ben...
2016-08-1111 minOVS OrbitP4 on the Edge, with John Fastabend from Intel
Interview with John Fastabend, an engineer at Intel whose work in the
Linux kernel has focused on the scheduling core of the networking stack
and Intel NIC drivers. John has also been involved in IEEE
standardization of 802.1Q and Data Center Bridging (DCB).
The interview focuses on John's recent work on P4 for edge devices, which
he presented at the P4
Workshop held at Stanford in May. The slides
for his talk are available.
John's work originated in the use of P4 as a language for describing the
capabilities of Intel NICs, as an alternative...
2016-08-0940 minOVS OrbitSoftFlow, with Ethan Jackson from Berkeley
Interview with Ethan Jackson, a PhD student
at Berkeley advised by Scott Shenker. Before Berkeley, Ethan worked on
Open vSwitch as an employee at Nicira Networks and then at VMware. His
contributions to Open vSwitch have greatly slowed since he moved on to
Berkeley, but as of this writing Ethan is still the second most prolific
all-time contributor to Open vSwitch measured in terms of commits, with
over 800.
Ethan talks about his experience implementing CFM and BFD
protocols in Open vSwitch. He found out that, whenever anything went
wrong in a network, the first thing that found...
2016-07-2038 minOVS OrbitAdding P4 to OVS with PISCES, with Muhammad Shahbaz from Princeton
Interview with Muhammad
Shahbaz, a third-year grad student at Princeton advised by Jennifer
Rexford and Nick Feamster. Shahbaz talks about his work on PISCES, a version of Open
vSwitch modified to add support for P4, a
language for programming flexible hardware switches, which will be
presented at SIGCOMM
in August 2016. Shahbaz is spending this summer as an intern at VMware,
where he is working to bring PISCE's features into a form where they can
be integrated into an upstream Open vSwitch release.
A P4 program specifies a number of different aspects of a switch: how
packets are...
2016-06-2631 minOVS OrbitMininet, with Bob Lantz and Brian O'Connor from ON.LAB
Interview with Bob Lantz and Brian O'Connor of ON.LAB, about Mininet software for simulating networks.
Bob previously gave a talk about Mininet (slides,
video) at the
Open vSwitch 2015
Fall Conference.
Bob describes the mission of ON.LAB and how he ended up there. He talks
about introducing the idea of a network operating system to ON.LAB. He
mentioned that his interest in networks arose from a lecture by Nick
McKeown in the EE380 lecture series at Stanford, in which Nick stated:
“Networks are like hardware without an operating system,” which piqued
Bob's interest.
...
2016-06-1848 minOVS OrbitThe OVS Development Process, with Kyle Mestery from IBM
Interview with Kyle Mestery, a Distinguished Engineer at IBM who has been
involved with Open vSwitch since about 2012, about the Open vSwitch
development process. Our conversation was based on Upstream
Open Source Networking Development: The Good, The Bad, and the Ugly,
a presentation at ONS
2016 given by Kyle along with Justin Pettit from VMware and Russell
Bryant from Red Hat. Kyle also gave a version of the talk with Armando
Migliaccio at OpenStack
Austin. The latter talk was recorded
on video.
The focus of the conversation is to present the Open vSwitch development
process by comparing it...
2016-06-1138 minOVS OrbitsFlow, with Peter Phaal from InMon
Interview with Peter Phaal of InMon,
about sFlow monitoring and how it is
used with Open vSwitch. In summary, an sFlow agent in a switch (such as
Open vSwitch or a hardware switch) selects a specified statistical sample
of packets that pass through it, along with information on how the packet
was treated (e.g. a FIB entry in a conventional switch or OpenFlow
actions in Open vSwitch) and sends them across the network to an sFlow
collector. sFlow agents also periodically gather up interface counters
and other statistics and send them to collectors. Data collected from
one or...
2016-06-0241 minOVS Orbitnlog, with Teemu Koponen from Styra and Yusheng Wang from VMware
Interview with Teemu Koponen of Styra
and Yusheng Wang of VMware, about
the nlog language.
nlog, in this context, is unrelated to the logging platform for .NET. It
is a database language, a simplified form of Datalog that lacks
recursion and negation. Teemu designed this language for use in Nicira
NVP, the forerunner of VMware
NSX-MH. Yusheng is now working to implement nlog in OVN.
Teemu and Yusheng begin by describing the nlog language, its name (the
“N” stands for “Nicira.”), and its purpose and contrast it with more
commonly known languages such as SQL. An nlog...
2016-05-2637 minOVS OrbitCilium, with Thomas Graf from Cisco
Interview with Thomas Graf of Cisco, regarding the Cilium project.
Cilium is a “science project” that Thomas and others at Cisco and
elsewhere are hacking on, to address the question of how to address
policy in a legacy-free container environment that scales to millions of
endpoints. It's an experiment because the outcome isn't yet certain, and
it's a question that hasn't seen much work outside of hyperscale
providers.
Cilium is based on eBPF, a
Linux kernel technology that introduces the ability for userspace to
inject custom programs into the kernel using a bytecode analogous to Java...
2016-05-2132 minOVS OrbitOVS in Production, with Chad Norgan from Rackspace
Interview with Chad Norgan of Rackspace, about use of Open vSwitch at
Rackspace over the years.
Topics include:
Chad's role at Rackspace and what he spends his time on.
Shifts in where he spends his time as Open vSwitch has matured.
Experiments with buying and writing SDN controllers and OpenFlow flows
at Rackspace, including a Ryu-based chassis controller.
SDN in two generations of Rackspace cloud, with NVP in the second
generation.
Tracing datapath flows using tools in Open vSwitch, using
“ovs-appctl ofproto/trace”, and the value of tracing for
debugging a running system.
Suggestions for improving “ovs-ap...
2016-05-0818 minOVS OrbitOPNFV and OVS, with Dave Neary from Red Hat
Interview with Dave Neary of Red Hat, concerning OPNFV and its
relationship with Open vSwitch.
Topics include:
The difference between SFC and NFV.
Importance performance constraints in NFV.
Telcos and NFV, and how telcos approached OpenStack.
How OPNFV bridges the telcos with OpenStack.
What telcos care about, and a definition of “carrier grade.”
Why carrier-grade features matter to everyone.
Downsides and tradeoffs of carrier grade, such as cost and
complexity.
Role of Open vSwitch in OPNFV, and why DPDK is important to NFV.
Importance of short 64-byte packets in NFV, e.g. for RTP (Real-time
Transport Prot...
2016-05-0423 minOVS OrbitPorting OVS to Hyper-V, with Alessandro Pilotti from Cloudbase
An interview with Alessandro Pilotti of Cloudbase, which Alessandro
describes as the company that takes care of everything related to
Microsoft technologies in OpenStack. The interview focuses on the
Open vSwitch port to Hyper-V, to which Cloudbase is a top contributor.
Highlights and topics in this episode include:
An overview of what Cloudbase does and what it works on in OpenStack.
Why Cloudbase started their Open vSwitch port to Hyper-V.
History of the VMware and Cloudbase ports to Hyper-V and how they
were merged into upstream Open vSwitch.
Alessandro's thoughts on how to favoring a user...
2016-05-0133 min
GeekscapeGeekscape 304: Talking Geek Style With Destin Pfaff and Rachel Federoff!Destin Pfeff and Rachel Federoff are best known as castmembers of the reality show 'Millionaire Matchmaker', but they're actually huge, passionate geeks. This episode, they bring to Geekscape their specific sense of style, educate me on the ins and outs of Cyberlesque and talk about growing up geeks. Destin gives his opinions on the new Robocop trailer and we discuss the plus and minuses of Hollywood remakes. Also, what advice would they give to geeks out there, searching for some love? Plus! Ben Dunn hangs out in the studio to find out if he and I can pull off some...
2013-09-1259 min
GeekscapeGeekscape 304: Talking Geek Style With Destin Pfaff and Rachel Federoff!Destin Pfeff and Rachel Federoff are best known as castmembers of the reality show 'Millionaire Matchmaker', but they're actually huge, passionate geeks. This episode, they bring to Geekscape their specific sense of style, educate me on the ins and outs of Cyberlesque and talk about growing up geeks. Destin gives his opinions on the new Robocop trailer and we discuss the plus and minuses of Hollywood remakes. Also, what advice would they give to geeks out there, searching for some love? Plus! Ben Dunn hangs out in the studio to find out if he and I can pull off...
2013-09-1256 min