January 2020 - people - netdevconf.info

congestion control in the bufferbloated age
by Dave Taht 23 Jan '20

23 Jan '20

I am unsure if I will make netdevconf this year, as increasingly interesting as the agenda seems. Might make it, might not. my talk at linux.conf.au last week was quite droll with lots of funny bits, and perhaps next year y'all might enjoy something like it, instead of something more serious? https://blog.apnic.net/2020/01/22/bufferbloat-may-be-solved-but-its-not-ove… I figure this time next year writing something more serious will be feasible as the l4s vs sce debate will have settled, and I'll plan on that. -- Make Music, Not War Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-435-0729

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0x14: Tutorial, How to add AF_XDP zero-copy support to drivers
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

AF_XDP is a relatively new technology optimized for high performance packet processing. It provides an abstraction over hardware rings, so the application can handle packets in a low-level, yet hardware-agnostic fashion. With conforming drivers, AF_XDP also provides zero-copy packet handling capabilities to the application. At its basic level AF_XDP works works fine with a lot of conforming drivers. Adding zero-copy support is more challenging. Maxim Mikityanskiy has been through trial-by-fire writting zero copy AF_XDP support and came out unscathed. In this tutorial, Maxim instructs on how a driver author would go about adding AF_XDP zero copy support using the mlx5e driver as an example. More info: https://netdevconf.info/0x14/session.html?tutorial-adding-AF_XDP-zero-copy-… cheers, jamal

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0x14: nutsnbolts talk, NVMe-over-TCP ≈ NVMe-over-RDMA
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Networks are getting faster but so is storage. It is not uncommon anymore for a single high performance storage device to deliver as much as a million read/write operations per second. For traditional remote storage accesses CPU requirements have become unsustainable. The recently merged NVMe-over-TCP has improved performance lowering CPU utilization. However, despite of its advantages of being able to use commodity NICs, NVMe-over-TCP's performance is still significantly worse than NVMe-over-RDMA. Rachit Agarwal, Qizhe Cai, and Jaehyun Hwang have some new ideas on how to significantly improve the status quo. They will discuss a design, implementation and evaluation of several new ideas within NVMe-over-TCP. Their design maintains all the desirable properties of NVMe-over-TCP (unmodified applications, unmodified TCP/IP stack, etc.), and yet, saturates a 100Gbps link for remote accesses using CPU utilization _similar to state-of-the-art user-space and RDMA-based solutions_. More information: https://bit.ly/2Ri6hJd cheers, jamal

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0x14: nutsnbolts talk, Hardware Acceleration of Container Networking Interfaces
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

In this talk Amritha Nambiar, Sridhar Samudrala, and Kiran Patil will discuss the current approaches used in offloading of container network interfaces. The talk will cover macvlan, ipvlan and subdevice functions in addition to some of the newly proposed generic interfaces to create virtual interfaces from a parent pci device. Challenges and limitations of the different approaches as well new ideas will be discussed. More information: https://www.netdevconf.info/0x14/session.html?talk-hardware-acceleration-of… cheers, jamal

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0x14: Tutorial, Programming QUIC
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

So you've heard of this new shiny transport called QUIC. You've even been to several presentations on QUIC at 0x12 and 0x13. And you are wondering how to write applications that run using QUIC transport. Or ... maybe you happen to know that if you pulled apart the Chromium tree and perform some tooling kungfu you could get QUIC infra sufficient for you to write a client or a server... Dmitri Tikhonov has a better idea. Why dont you show up in Vancouver for 0x14? He will be giving a tutorial on how to write applications on top of HTTP/3 QUIC based on the lsquic library. The tutorial will be instructor-led and will start with a (very) short QUIC and HTTP/3 basics introduction followed with a delve into the innards of the lsquic library and leading to interactive coding of simple echo server and client programs. And, of course more.. All the demoed code will be made available on github. More info: https://bit.ly/30HDNvy cheers, jamal

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0x14: moonshot talk, Complex Network Services With eBPF
by Jamal Hadi Salim 21 Jan '20

21 Jan '20

The PC has accepted another moonshot talk! eBPF is great, but: unfortunately it gravitates to the appliance world model (lumping data and control in one pile) - which is ideal for solving simple one-off business problems. Writing complex network services with eBPF is a lot more painful. In this moonshot talk, Sebastiano Miano et al introduce the Polycube project that eases ability to write complex network services with eBPF. Polycube network services have an architecture that moves away from the appliance model by separating data from control and management plane. With its model-driven architecture, Polycube exposes REST APIs for service management. This talk will go into some detail of the Polycube APIs and abstractions and then illustrate the power of Polycube with a small live demo. More information: https://bit.ly/2NM9fDL cheers, jamal

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0x14: Transport workshop
by Jamal Hadi Salim 21 Jan '20

21 Jan '20

Neal Cardwell, Yuchung Cheng and Soheil Hassas Yeganeh will chair the Transport workshop. The workshop will have many discussions on current topics in transport-layer issues in the kernel, including (but not limited to): - different protocols in the Linux kernel: TCP, MPTCP, SCTP, ... - congestion control, loss recovery, and protocol improvements - new development, performance work, measurement, real-world production experience - eBPF integration with the transport layer - etc The workshop will consist of slide presentations and extended group discussions. More information: https://netdevconf.info/0x14/session.html?workshop-transport cheers, jamal

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0x14: XDP workshop
by Jamal Hadi Salim 20 Jan '20

20 Jan '20

Saeed Mahameed will chair the netdev 0x14 XDP workshop. Many discussions on a variety of XDP issues will take place - including follow ups on outstanding challenges, updates on existing features and new ideas on a variety of topics ranging from performance, acceleration and many more. Come and be part of the discussions. Current Workshop agenda (subject to update) includes: - XDP HW metadata hints - XDP on hosts pain points summary - XDP egress, development status and use case - Page pool skb recycling - Performance gains seen with iommu - Death-by-a-thousand-paper-cuts parable (related to XDP!) - etc More information: https://netdevconf.info/0x14/session.html?workshop-XDP cheers, jamal

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0x14: Talk Accepted, Test Your Limits With TRex Traffic Generator
by Jamal Hadi Salim 20 Jan '20

20 Jan '20

The Program Committee has accepted another nutsnbolts talk. So you have 100Gbps port and you want to do high performance network testing for your shiny new Linux kernel feature.... Folks, your options are pretty much limited to expensive, commercial equipment(we are talking hundreds of thousands of $$). Or you could use Trex. Come and hear Hanoh talk about Trex. Trex leverages COTS x86/ARM servers and most modern physical NICs. What can Trex do for your perfomance testing? - generate upto 200gbps/100mpps advance traffic pattern - millions of real world tcp/udp flows both stateful and stateless for testing packet forwarding and end servers. - Millions of Connection/s (CPS) for flows - etc Hanoh will share the experiences they gained when writting Trex that apply to scaling Linux networking; he hopes to inspire some of the techniques to be adopted in Linux. More info: https://netdevconf.info/0x14/session.html?talk-test-your-limits-with-trex-t… cheers, jamal

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0x14: Invitation letters
by Jamal Hadi Salim 19 Jan '20

19 Jan '20

Hi, Apologies again because we are unusually late opening registration this time. We are temporarily changing our policy for issuing invitation letters. Typically we request you register before we issue a letter. This time, starting now, up to the moment registration opens you can request for the invitation letter. Send email to registrar(a)netdevconf.info for invitation letter requests. cheers, jamal

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people January 2020