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Dave Taht
by Tom Herbert 03 Apr '25

03 Apr '25

Dear Netdev Community, I am very sad to report the passing of Dave Taht. Dave was one of our own! He was a long time contributor and participant in Netdev, and was committed to solving Bufferbloat and improving the Internet for everyone. He will be missed! Anyone who has attended Netdev conferences knows that Dave was one of our more "interesting" participants. He was full of life and a very kind soul. At Netdev 0x17, he shared his wonderful music with us in one of the most memorable sessions in Netdev history. Below are links to a couple of songs from that and also a link to the whole session. "There's something happening here" https://youtu.be/bk6umx95ouo "Hallelujah" https://youtu.be/UnGqbDSIPzQ "Music BoF from Netdev0x17" https://youtu.be/D9RGX6QFm5E Thanks, Tom -- on behalf of Netdev Society Board

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0x19: Pin for location
by Jamal Hadi Salim 16 Mar '25

16 Mar '25

From Christie: Here is a pin location to find entrance (Jug in Croatian) 2: https://maps.app.goo.gl/kLPVg1PWbqGBwRwQ6?g_st=com.google.maps.preview.copy See attached photo. cheers, jamal

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Pizza party 🍕
by Christie Geldart 12 Mar '25

12 Mar '25

Hi everyone! I hope you’re all enjoying the start of Netdev 0x19. Tonight, following the last talk, we with have pizza and some sponsor swag in track 1 room. There’s some pretty nice swag if you ask me! Stick around to hang out if you can 🍕🕺. Christie

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0x19: Tutorial, Introduction to eBPF socket maps
by Jamal Hadi Salim 10 Mar '25

10 Mar '25

Cong Wang will give a tutorial on eBPF socket maps. Cong will make an in-depth examination of eBPF socket maps, along with illustrative instances. In addition, he will present the historical developments and recent advancements of eBPF socket maps. Cong hopes this tutorial will give the attendees a complete picture of eBPF socket maps. More details: https://netdevconf.info/0x19/sessions/tutorial/introduction-to-ebpf-socket-… cheers, jamal

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Pin location
by Christie Geldart 10 Mar '25

10 Mar '25

Good morning everyone, There seems to be an issues with the pin, please try this one: https://maps.app.goo.gl/PbJnmCNDTS3XGkFLA?g_st=com.google.maps.preview.copy Look for signs for Gastro Globus events & catering. See you shortly, Christie

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0x19: Bronze sponsor, NVIDIA!
by Jamal Hadi Salim 09 Mar '25

09 Mar '25

We are pleased to welcome back NVIDIA (https://www.nvidia.com/) as a bronze sponsor for Netdev conf 0x19! Thank you for your sponsorship! NVIDIA is the leader in open networking with end-to-end solutions for SmartNICs, DPUs, open optics, and accelerated data center switches. NVIDIA is committed to open-source at all layers of the software and hardware stack with open networking initiatives like Linux Networking, SwitchDev, DENT, and the SONiC network operating systems and believes that open-source has the power to accelerate innovation and benefits everyone. cheers, jamal

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Netdev 0x19 - main entrance
by Christie Geldart 09 Mar '25

09 Mar '25

Hi everyone! Netdev 0x19 starts tomorrow ! The conference location is Zagreb fair is https://www.google.com/maps/search/Dubrovnik+Avenue+15?entry=gmail&source=g, south entrance #2. Please see attached photo for a visual of the entrance. See you tomorrow! Christie

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0x19: Keynote, Understanding and Improving Robustness of Networked Systems With Machine Learning
by Jamal Hadi Salim 01 Mar '25

01 Mar '25

We are honored to have Brighten Godfrey as our keynote speaker for 0x19! Brighten is currently a Professor in the Siebel School of Computing and Data Science at the University of Illinois Urbana-Champaign. He co-founded and served as CTO of network verification pioneer Veriflow which was acquired by VMware (now Broadcom, where Brighten still serves part-time). Brighten has a strong background in networked systems and algorithms and has received multiple awards for his work. In this keynote talk, Brighten asserts that, while networks are essential infrastructure they are complex and hard to fully understand, even for experts. This complexity makes it difficult to ensure reliable performance. Brighten argues that Machine Learning(ML) can be put to use to analyze and understand complex network systems and improve their robustness. Brighten will further discuss using ML as an "adversary" to find weaknesses in networked environments where congestion control implementations perform poorly, and help to automatically diagnose performance problems in distributed cloud applications. More Details: https://netdevconf.info/0x19/sessions/keynote/understanding-and-improving-r… cheers, jamal

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0x19: Bronze Sponsor, ByteDance!
by Jamal Hadi Salim 21 Feb '25

21 Feb '25

We are pleased to welcome back ByteDance as bronze sponsors for Netdev 0x19. Thank you for your support! Founded in 2012, ByteDance's mission is to inspire creativity and enrich life. With a suite of more than a dozen products, including TikTok, Helo, and Resso, as well as platforms specific to the China market, including Toutiao, Douyin, and Xigua, ByteDance has made it easier and more fun for people to connect with, consume, and create content. See: https://www.bytedance.com/ cheers, jamal

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0x19: Bronze Sponsor, Fastly!
by Jamal Hadi Salim 20 Feb '25

20 Feb '25

We welcome back Fastly as a bronze sponsor! Fastly is a programmable edge cloud platform that helps developers create secure, scalable, fast digital experiences. Open source is a part of the Fastly heritage, which is essential to their operations, and central to their future. Checkout: https://netdevconf.info/0x19/news/bronze-sponsor-fastly.html cheers, jamal

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0x19: Please register!
by Jamal Hadi Salim 20 Feb '25

20 Feb '25

Folks, Please, if you can help it and are planning to attend, avoid the last minute dev style registration (which happens every time!). The sooner you register the better we can plan better on how we feed you! Here are the sessions so far in case you were still wondering: Tutorials: https://netdevconf.info/0x19/pages/sessions.html#tutorial BoFs: https://netdevconf.info/0x19/pages/sessions.html#bof Workshops: https://netdevconf.info/0x19/pages/sessions.html#workshop Talks: https://netdevconf.info/0x19/pages/sessions.html#talk Schedule: https://netdevconf.info/0x19/pages/schedule.html cheers, jamal

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0x19: secunet, Bronze Sponsor!
by Jamal Hadi Salim 17 Feb '25

17 Feb '25

We are pleased to welcome back friends of the conference, secunet, as a bronze sponsor for Netdevconf 0x19! secunet is a long time supporter of the conference. We are grateful for their continued support. So who is Secunet? secunet(https://www.secunet.com/) is Germany’s leading cybersecurity company. In an increasingly connected world, the company’s combination of products and consulting assures resilient digital infrastructures and the utmost protection for data, applications and digital identities. secunet specialises in areas with unique security requirements – such as cloud, IIoT, eGovernment and eHealth. With security solutions from secunet, companies can maintain the highest security standards in digitisation projects and advance their digital transformation. secunet is an IT security partner to the Federal Republic of Germany and a partner of the German Alliance for Cyber Security. cheers, jamal

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0x19: Bronze Sponsor, RELIANOID
by Jamal Hadi Salim 13 Feb '25

13 Feb '25

We welcome back long time sponsor RELIANOID, as a bronze sponsor. Thank you for your continued support RELIANOID! RELIANOID simplifies the complexity of the site reliability through network and application load balancing, security, high availability, and identity protection. RELIANOID services are open core and are delivered by a dedicated team of experts with experience built over 15 years. Discover the Site Reliability Experience with RELIANOIDhttps://www.relianoid.com/ cheers, jamal

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0x19: Tentative Schedule Published!
by Jamal Hadi Salim 11 Feb '25

11 Feb '25

Subject says it all: https://netdevconf.info/0x19/pages/schedule.html cheers, jamal

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Zagreb ticket - 11th Feb
by Vincent JARDIN 11 Feb '25

11 Feb '25

Hi Jamal, I was about to book 3 entry pass today since we are still the 11th of February but the early bird entry pass is not available anymore, please can you check ? From the website, they should be available till today : Early Bird Rate Jan 19th - Feb 11th Physical - $250 USD Thank you, Vincent

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0x19: Registration open
by Jamal Hadi Salim 10 Feb '25

10 Feb '25

Folks, Registration for 0x19 is now open! Register early to take advantage of early bird rate. https://netdevconf.info/0x19/registration cheers, jamal

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0x19: Talk, Host-based TCP Connection Migration
by Jamal Hadi Salim 09 Feb '25

09 Feb '25

Current approaches to migrate TCP connections (using TCP_REPAIR) across machines require middle box support for seamless transparency. Most existing proposals use the Intel/Tofino programmable P4 switch for this purpose, an approach which is operationally burdensome. Shuo Li, Steven Chien, Tianyi Gao and Michio Honda describe a proposal that obviates the need for programmable switches. In their approach, the host that has established the connection is responsible for the traffic redirection. They use a combination of TC hardware offload and eBPF to achieve their goals. The authors will go over the implementation details and challenges and finally illustrate how they integrate their connection migration method with Ceph, a widely-used object storage system to illustrate a specific use case. Details: https://netdevconf.info/0x19/10 cheers, jamal

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0x19: Talk, Reservoir to the tap: with fairness and humility
by Jamal Hadi Salim 09 Feb '25

09 Feb '25

Fintech workloads and few other modern work loads require very fine grained control (down to a couple of milliseconds) over packet pacing and at the same time be able to do this for millions of flows; all requiring different granularity of flow pacing. In this talk, Anjali S Jain, Vadivel Kannappa, Joshua Hay, Robert Hathway, Magnus Karlsson, Chihjen Chang, Naren Mididaddi, Priyalee Kushwaha and Milena Olech go into implementation details of how to achieve these requirements. Details: https://netdevconf.info/0x19/32 cheers, jamal

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Communication via Internal Shared Memory (ISM) - Time to open up
by Jamal Hadi Salim 09 Feb '25

09 Feb '25

Internal Shared Memory (ISM) is a method for synchronous, access controlled, direct memory access into dedicated memory regions between systems that share the same physical memory. With increased popularity of using shared memory semantics over the network protocols (see all the AI/ML craze going on), this talk will shed some light on these many years of experience on huge mainframes and other related efforts. In this talk Alexandra Winter will demystify for us ISM, its features and usecases, and explain several proposals that have been made to extend the usage of ISM. Alexandra will further discuss what would be the best way to provide clean interfaces in the Linux kernel, to enable future extensions. An early RFC has been sent to the netdev mailing list with a proposal for an ism layer - to finally make it open to the masses. Details: https://netdevconf.info/0x19/12 cheers, jamal

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0x19: Talk, Optimizing Bandwidth Allocation with ETS and Traffic Classes
by Jamal Hadi Salim 09 Feb '25

09 Feb '25

In the current deployed approach in Linux, the operator does not have much control over how wire bandwidth is allocated between VFs. For example, when provisioned, a 50Gbps PF's equally split between two VFs, giving each 25Gbps, with traffic classes (e.g., TC0 and TC1) limited to percentages of these smaller allocations. Carolina Jubran says implementing ETS hardware support allows for control over such allocations. Using TC bandwidth allocation, the PF can instead be divided directly into 80% for TC0 and 20% for TC1 across the two VFs. In this talk, Carolina will describe the insufficiency of existing approaches to solve these problems, reference previous work, and demonstrate how this implementation improves resource allocation across VFs by applying traffic class-based bandwidth proportions, supported by real-world results and a demo. Details: https://netdevconf.info/0x19/14 cheers, jamal

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0x19: Talk, mq-cake: Scaling software rate limiting across CPU cores
by Jamal Hadi Salim 09 Feb '25

09 Feb '25

Qdiscs rely on global lock to sync state across CPUs and therefore dont scale in presence of many cores (or in presence of very high bandwidth). Jonas Köppeler, Toke Høiland-Jørgensen, and Stefan Schmid implemented a multi-queue variant of sch_cake that can scale its rate limiting across hardware queues (and thus CPU cores) by sharing a bit of state on top of the mq qdisc. In this talk, they will present the implementation, performance evaluation, as well as discuss their proposal for an API that will make this work upstreamable, and applicable to other qdiscs as well. Details: https://netdevconf.info/0x19/16 cheers, jamal

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0x19: Talk, Linux Kernel Support for IOAM Direct Exporting
by Jamal Hadi Salim 08 Feb '25

08 Feb '25

In Situ Operations, Administration, and Maintenance (IOAM) provides a way to collect telemetry data on devices, e.g., switches and routers, in so-called limited domains (e.g., a datacenter or a service provider). Recently standardized in the IETF, IOAM has been developed with various operation modes (i.e., option-types) in order to be suitable for as many potential use cases as possible. In this talk, Maxime Goffart, Justin Iurman, Emilien Wansart and Benoit Donnet describe the IOAM Direct EXporting (DEX) option kernel implementation which allows each network device on the path to locally aggregate and/or export telemetry data towards one or more collector(s). The implementation comes with support in ubiquitous user space tools. The authors will the implementation details and challenges as well as present performance results. Details: https://netdevconf.info/0x19/11 cheers, jamal

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0x19: Talk, Open Source Tooling for PHY Management and Testing
by Jamal Hadi Salim 08 Feb '25

08 Feb '25

One of the techniques the ethernet physical layer uses to achieve high speed rates is pulse-amplitude modulation(PAM). An implementation of a specific physical layer is commonly referred to as PHY. If you want to adjust the speed on the wire from say 1Gbps to 800Gbps (caveat emptor!) you pick a different set of signal ranges to be used for equalization for different combinations of bits on the wire. When a vendor ships you a NIC, these ranges will be embedded in the firmware and are fixed. If you have to interop then the idea is the peer NIC vendor has similar settings. How do you test these ranges? Lee Tragger says there are no open source tools available. Essentially, vendors provide their own proprietary tools to set equalization values and run pattern tests. In this talk, Lee will discuss whether setting equalization values and enabling pattern tests has matured enough across various vendors to develop a standard open source interface. Details: https://netdevconf.info/0x19/37 cheers, jamal

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0x19: Talk, Democratizing Far Edge Networking: Journey of Mainlining Wired and Wireless in Linux Kernel
by Jamal Hadi Salim 08 Feb '25

08 Feb '25

In this talk, Robert Marko will discuss real-world experiences and lessons learned from mainlining support for various wireless and wired SoCs, including Qualcomm's IPQ40xx platform, Marvell's Prestera switches, Microchip Sparx-5 and LAN969x family of products, as well as upcoming work on MaxLinear's SoCs. Robert will explore the challenges and benefits of using upstream Linux for edge networking, including the evolution of frameworks like switchdev for network switch ASICs and the wireless subsystem for access points. The talk will cover specific examples of upstreamed patches, discussing the technical aspects of bringing up new hardware support while maintaining clean abstractions. The speaker will examine how standardized Linux interfaces like switchdev can replace traditionally proprietary stack while providing equivalent functionality. Details: https://netdevconf.info/0x19/35 cheers, jamal

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0x19: Talk, The Battle Of The ZCs: Who is the prettiest of them all?
by Jamal Hadi Salim 07 Feb '25

07 Feb '25

In this talk, Nabil Bitar, Jamal Hadi Salim, Victor Nogueira and Pedro Tammela investigate the performance characteristics of two new high-performance application networking mechanisms in Linux: TCP devmem and IOURING zero copy. While TCP devmem is designed for zero copy to/from network/accelerators (such as GPUs), in order to compare to IOURING, the authors look at it from the perspective of client-server application; in the case of devmem, copying to/from user memory (udmabuf). Both these techniques are new to the Linux world and are still not fully integrated into Linux proper at time of the study - making them both challenging to deal with (kernel bugs popping up for example) and a bit of a mystery to most application writers. In addition to sharing the comparative results, the authors will shed some light for application writers to use these features. cheers, jamal

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