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0x1A: BoF, Network Observability
by Jamal Hadi Salim 17 Jun '26

17 Jun '26

Jason Xing will lead a BoF on the exciting topic of network observability. Network observability has evolved from classic tools like `tcpdump` toward richer, layered capabilities that let engineers trace root causes after problems arise. The scope of this BoF is to discuss new ideas and survey existing techniques (which collect wide-ranging data points such as latency, throughput, skb drops, protocol diagnostics, reference counting, and many others). Specific sub-topics on the current agenda: 1. BPF timestamping 2.0: finer-grained, very low-overhead timestamping for broader use cases. 2. IETF TCP reset diagnostic payload: replacing current reset reasons with common APIs and messaging. Very welcom topics for discussion include how AI's rapid evolution may reshape network observability. Please ping Jason if you want to participate! More details: https://netdevconf.info/0x1A/sessions/bof/network-observability-bof.html cheers, jamal

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0x1A: Talk, Resilient AI Supercomputer Networking using MRC and SRv6
by Jamal Hadi Salim 16 Jun '26

16 Jun '26

At very large scale AI training, tail latency and not average latency, is what limits synchronous pretraining performance. Christoph Paasch will discuss how MRC resolves these issues by: 1. Introducing a new RDMA transport protocol that sprays traffic across many paths and actively load-balances, eliminating flow collisions. 2. Creating Multi-plane Clos topologies and enabling >100K-GPU training clusters as two-tier networks with high switch radix and physical redundancy. 3. And last, using static SRv6 source-routing which gives MRC autonomous, failure-bypassing path control. The talk will describe experiences running MRC and static SRv6 routing in production within OpenAI and Microsoft’s largest training clusters where it has been used to train the latest frontier models. Christoph will discuss operational experience showing how MRC allows AI training jobs to ride out many network failures that previously would have interrupted training. cheers, jamal

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0x1A: Bronze Sponsor, Common Net!
by Jamal Hadi Salim 16 Jun '26

16 Jun '26

We are pleased to welcome Common Net as a bronze sponsor! Common Net is not only a bronze sponsor but is also playing a critical role in hosting the conference in Rome. We'd like to thank for all their efforts in helping make the conference a success. Common Net is an independent Italian telecom operator that owns and operates its own data centers, fiber, and fixed-wireless networks. Founded by engineers, it provides cloud and connectivity services across Italy using open-source and standard technologies, with no resellers or vendor lock-in. It also contributes upstream to open-source projects including the Linux kernel, and is sponsoring Netdev 0x1A in its home city, Rome. More details: https://netdevconf.info/0x1A/news/bronze-sponsor-common-net.html cheers, jamal

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0x1A: Workshop, SRV6
by Jamal Hadi Salim 16 Jun '26

16 Jun '26

Stefano Salsano chairs the classical SRV6 workshop. Current topics for discussion include: - Source-routed AI backend networks - SRV6 L2 services beyond VXLAN - Provider-grade deployment and service protection Come and participate in these discussions! More details: https://netdevconf.info/0x1A/sessions/workshop/srv6-workshop.html cheers, jamal

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0x1A: BoF, Your Fu is Better Than Mine, 3.0!
by Jamal Hadi Salim 15 Jun '26

15 Jun '26

PJ is back with the ever-popular, often-requested, BoF v3! PJ says: This is a safe space, a judgement-free zone. Come with your cool hacks, workflows, test harnesses, whatever. This is a place where all of us who have worked in this space for decades or months can converge, and share knowledge of how we work in this space better. If you’re interested, just bring a short demo. Bonus points this year if we can ride the AI train, and bring a Skill or share effective prompts. Or a simple benchmark that you can show why it’s important to you. No judgements, just pure sharing. Often people in the audience get encouraged by who is presenting, and spontaneously decide to present something of theirs. That’s the spirit of the OG BoF. Let’s do this again, again. cheers, jamal

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0x1A: BoF, Could an IPv6-Only Kernel Be a Reality? An Architectural and Performance Evaluation
by Jamal Hadi Salim 15 Jun '26

15 Jun '26

Fernando Fernandez Mancera chairs this BoF which explores the feasibility of a standalone IPv6 Linux kernel, decoupling it from its current mandatory dependency on the IPv4 stack. The BoF presenters will share an experimental implementation, analyze its impact on architecture and performance, and seek community feedback on an upcoming RFC to identify potential blockers for upstream integration. cheers, jamal

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0x1A: BoF, Need for Bidirectional Event Handlers in Auxiliary Bus
by Jamal Hadi Salim 15 Jun '26

15 Jun '26

The auxiliary bus enables clean PCI device partitioning into multiple drivers but lacks a native signaling mechanism for bi-directional event notifications. Dave Ertman says this restricts communication to a passive model where the parent merely exposes data for the child to consume, hindering real-time coordination for critical events like resets, configuration changes, or cross-driver resource management. Dave has a proposal to address these challenges but there are open questions. Come and interact and provide your feedback. More details: https://netdevconf.info/0x1A/sessions/bof/bof-need-for-bidirectional-event-… cheers, jamal

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0x1A: XDP Workshop!
by Jamal Hadi Salim 14 Jun '26

14 Jun '26

Alexander Lobakin will chair the classical XDP workshop. Come and participate in discussions on current topics and toss some new ideas! cheers, jamla

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0x1A: Tutorial, Making Time Uncertainty a First-Class Concept in Linux Timing
by Jamal Hadi Salim 14 Jun '26

14 Jun '26

Maciek Machnikowski continues his tradition of teaching us about Time. In this session, Maciek reframes timestamps as intervals with quantified uncertainty rather than precise points, arguing that explicit uncertainty windows let applications reason about temporal correctness without hidden accuracy assumptions. He discusses sources of uncertainty such as clock sync offsets, network delay jitter, hardware timestamping limitations, and kernel-to-userspace transfer paths. Ignoring these, argues Maciek, causes errors in ordering, causality detection, and compliance checks. He will describe a time-uncertainty daemon sample and discuss Linux kernel API gaps. Come and grow your knowledge with a real human maestro! More details: https://netdevconf.info/0x1A/sessions/tutorial/making-time-uncertainty-a-fi… cheers, jamal

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0x1A: early bird rate extended to June 18
by Jamal Hadi Salim 13 Jun '26

13 Jun '26

The cheep cheep early bird registration has been extended to June 18. Register now to take advantage of the discount. https://netdevconf.info/0x1A/pages/registration.html cheers, jamal

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