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0x13: Nuts and bolts Talk, Veth XDP: XDP for containers
by Jamal Hadi Salim 13 Feb '19

13 Feb '19

Toshiaki Makita and William Tu will describe their effort on improving container network acceleration. The talk will go into details of both veth XDP as well as AF_XDP. More info: https://www.netdevconf.org/0x13/session.html?talk-veth-xdp A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot, HW acceleration of XDP real world use cases
by Jamal Hadi Salim 13 Feb '19

13 Feb '19

XDP has seen great use in addressing challenges such as DDOS attack detection and prevention, stateful load balancing and more. In this talk Rony Efraim and Tal Gilboa present a solution architecture and API approach that show cases hardware-software interaction for accelerated HW XDP. Their work is based on Mellanox hardware. They hope to elicit a discussion to further look at future capabilities based on programmable adapters. More info: https://netdevconf.org/0x13/session.html?talk-hw-accel-xdp-use-cases A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: nutsnbolts, Demystifying The TC Ugly (or Universal) 32bit Key Packet Classifier
by Jamal Hadi Salim 12 Feb '19

12 Feb '19

The ugly^WBeatiful 32 bit classifier is the mother of all classifiers in the linux kernel. It is the only native classifier that can be taught by a user policy "how to" classify based on user traffic heuristics. U32 is a low level classifier operating on packet-offset-length-value. Sometimes this could be confusing for the faint-hearted. In this talk, Jamal et al are going to dig into u32 and show basic principles, expose flexibility for customization. They will then illustrate customization use cases for a small(hundreds of rules) and a medium sized (10s of thousands of rules) LAN access control and provide performance numbers. More info: https://www.netdevconf.org/0x13/news.html?talk-tc-u-classifier A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot talk, Shenango: Achieving High CPU Efficiency for Latency-sensitive, Datacenter Workloads
by Jamal Hadi Salim 12 Feb '19

12 Feb '19

Datacenter applications demand microsecond-scale tail latencies and high request rates from operating systems. Achieving these goals in a CPU-efficient way is an open problem. Because of the high overheads of today’s kernel, the best available solution to achieve microsecond-scale latencies is kernel-bypass networking, which dedicates CPU cores to applications for spin-polling the network card. But this approach wastes CPU: even at modest average loads, one must dedicate enough cores for the peak expected load. In this talk Amy Ousterhout will describe the approach taken by Shenango which achieves much better CPU efficiency while maintaining the high request rates. More info: https://netdevconf.org/0x13/session.html?talk-shenango A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: V-switch Live-migration Support For Virtio With SRIOV VF Datapath
by Jamal Hadi Salim 12 Feb '19

12 Feb '19

NutsBolts Talk. As of kernel 4.18 the virtio guest driver uses the SRIOV VF channel when it can or otherwise falls back to the classical the para-virtual channel. With this setup live-migration of VMs running under SRIOV is possible. Or Gerlitz and Parav Pandit handle the v-switch host side of the equation for live-migration. They propose a design based on the switchdev mode for NIC host drivers. More info: https://netdevconf.org/0x13/session.html?talk-v-switch-virtio-sriov-vf-data… A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot talk, Paced Chirping - Rethinking TCP start-up
by Jamal Hadi Salim 12 Feb '19

12 Feb '19

TCP slow start faces a dilemma: Either you take too long to ramp up or you ramp up too fast and cause significant queuing delays. Joakim Misund et al defined Paced Chirping which gets a flow to achieve fast acceleration with virtually no queuing delay The implementation extends the kernel's pacing framework to allow a congestion control module to create "chirps" with desired characteristics. Joakim will describe the implementation and how one would use the extensions. More info: https://netdevconf.org/0x13/news.html?talk-chirp A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot talk, Making the Linux TCP stack more extensible with eBPF
by Jamal Hadi Salim 12 Feb '19

12 Feb '19

Viet-Hoang Tran and Olivier Bonaventure leverage Lawrence Brakmo's eBPF TCP-BPF framework to allow TCP options extensions. Users can attach eBPF code to inject and consume TCP options. The authors will describe the code architecture (currently on top of Kernel 4.17-rc5), illustrate their use cases and finally provide performance numbers. More info: https://netdevconf.org/0x13/session.html?talk-tcp-ebpf A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot Talk, Designing sockets for U-LPWA wireless technologies
by Jamal Hadi Salim 11 Feb '19

11 Feb '19

Low-Power Wide Area Network (LPWAN) wireless technologies sacrifice data throughput for long-range communication with to preserve battery lifetime. Andreas Färber created a design to bring LoRa PHY sockets into the Linux kernel, with LoRaWAN MAC layered on top. As he interacted with other LPWA or WPA network technologies stake holders it was natural for more discussions to surface. This talk will give an update on where the discussions have gone for LoRa, FSK, etc., with focus on netlink layer, protocol families and socket addresses. Andreas hopes to elicit more discussions and reach a consensus. More info: https://www.netdevconf.org/0x13/news.html?talk-ulpwa A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Moonshot Talk, End-to-end networking with ILNP
by Jamal Hadi Salim 11 Feb '19

11 Feb '19

The Identifier-Locator Network Protocol (ILNP) is defined as an Experimental Internet Protocol by the Internet Research Task Force (IRTF) in RFCs 6740-6748. At the heart of the ILNP architecture is the desire to address the deprecation of IP addresses. ILNP replaces IP address semantics with use of node Identifiers and network Locators using IPv6. No application changes needed. Current kernel implementation is on top of 4.19. Ryo and Saleem plan to upgrade to a newer kernel and push upstream. In this talk they will describe the ILNP architecture, the kernel implementation of ILNP and include results of testbed experiments for IP-level mobility. More info: https://www.netdevconf.org/0x13/session.html?talk-ilnp cheers, jamal

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0x13: Talk, Moonshot: Improved syscall batching for network I/O
by Jamal Hadi Salim 11 Feb '19

11 Feb '19

Network applications can benefit from reduced CPU cycles by amortizing the system call overhead of network I/O operations. In this talk Rahul et al review two existing interfaces for network I/O batching namely recvmmsg()/sendmmsg() and SO_RCVLOWAT and then propose extensions to these mechanisms. We show an 8x syscall reduction with our traffic patterns (gaming scenarios) with the usage of such extensions. More info: https://netdevconf.org/0x13/session.html?talk-syscall-batch A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Nutnsbolts Talk, Is Reimplementation of network stack a good idea or not?
by Jamal Hadi Salim 10 Feb '19

10 Feb '19

Hajime Tazaki is a man on a mission. We have seen him before talking about the Linux Kernel Library (LKL) whose intention was to take the whole of the linux kernel network stack and make it available in user space. He has since been staring at other possible candidates for user space network stacks. Hajime tries to come up with some metrics on how to measure "maturity" of network stack implementations: Using network protocol conformance tests of various IETF standards (RFCs) across multiple userspace network stack implementations. In this talk, he is going to share the preliminary results, findings of buggy implementations, and possible testing framework that is going to be used going forward https://netdevconf.org/0x13/session.html?talk-reimp-stack A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: nutsnbolts talk, Bottlenecks in increasing network speeds
by Jamal Hadi Salim 10 Feb '19

10 Feb '19

Over the last few years, NIC speeds have gone up from 1G to 10G to 25G to 40G and now 100G and 200G and even 400G NICS are going to be showing up in the commodity market soon. Every time these rates go up, new challenges come to the surface in the kernel. It is imperative to understand those issues and resolve them. In this talk Tariq Toukan will review the main bottlenecks that were/are being addressed to support NIC speeds of 100Gbps, 200Gbps, and beyond. He will summarize several ideas and solutions ranging from traditional tricks of the trade like page recycling to innovative HW capabilities that helped to recently achieve milestone packet rate of 100 Million PPS in XDP_TX and 135Mpps in XDP_DROP. More info: https://netdevconf.org/0x13/session.html?talk-bottlenecks A reminder to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: moonshot, Linux on Access Switches: Requirements & Features
by Jamal Hadi Salim 10 Feb '19

10 Feb '19

The Linux kernel has successfully made its way across datacenter top-of-rack and spine switches. David Lamparter says the data centre is a friendly sane environment. You aint seen nothing yet. Campus distribution and access switches need to deal with a much more hostile environment. In this talk he intends to collate the currently relevant features for deploying campus and access environments. He will give some operational context, and suggest implementation strategies. https://netdevconf.org/0x13/session.html?talk-linux-switch-req-feat A note to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: DUALPI2 - Low Latency, Low Loss and Scalable (L4S) AQM
by Jamal Hadi Salim 10 Feb '19

10 Feb '19

Nutsnbolts talk. Olga Albisser et al will describe the DUALPI2 AQM qdisc. DualPI2 AQM is part of the IETF L4S infrastructure standardization. An initial patch was posted on the list. The primary goal of DUALPI2 AQM is to provide ability to deploy congestion controls like DCTCP (which is traditionaly deployed in data centres) on the internet. In this talk, Olga will present the details of DUALPI2 implementation and explain problems it solves. More info: https://netdevconf.org/0x13/session.html?talk-DUALPI2-AQM A note to all: Early bird registration is still open until Feb 20th. https://netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Viscum: A New Light Weight Architecture of Mobile Edge Computing
by Jamal Hadi Salim 10 Feb '19

10 Feb '19

Nutsnbolts talk. Multi-access edge computing (MEC) was intended as a network architecture that offers cloud-computing capabilities within the RAN or core network in the cellular world to allow processing of tasks closer to the cellular customer. It has, however, evolved to be generic to apply to any network for deploying applications and services as well as to store and process content in close proximity to mobile users. Current MEC approaches are too invasive. In this talk, Feng et al propose an alternative light weight mobile edge computing architecture which utilizes existing Linux kernel mechanisms, namely: Traffic Control (TC) utilities, and network Namespaces. The talk will go into details on how the Linux facilities are used and challenges encountered. https://netdevconf.org/0x13/session.html?talk-viscum cheers, jamal

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0x13: Conntrack: tales of software datapaths
by Jamal Hadi Salim 09 Feb '19

09 Feb '19

Accepted talk. Aaron Conole and Marcelo Leitner want to make it easier to integrate TC offload with conntracking. This talk will describe their efforts to integrate ConnTrack with TC in software datapath. They will describe their implementation approach, the challenges that they had to overcome, testing approach taken and finally some preliminary performance numbers. In the second phase of the talk they will cover eBPF extensions for integrating with ConnTrack and present performance numbers. https://netdevconf.org/0x13/session.html?talk-conntrack-tales cheers, jamal

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0x13: An Asynchronous Dataplane for FRR
by Jamal Hadi Salim 09 Feb '19

09 Feb '19

Nuts and bolts Talk. The FRR (Free-range Routing) software suite is going through a revamp. There is a move to an async threaded model which is planned to utilize new netlink features to improve scalability. This model will also allow programming FIBs and NHs on remote systems. In this talk Mark Stapp will describe the current state of the work and challenges involved in achieving this goal. Some initial results and future plans will be discussed. https://netdevconf.org/0x13/news.html?talk-FRR-async cheers, jamal

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0x13: Nutsnbolts Talk, XDP based DDoS mitigation
by Jamal Hadi Salim 08 Feb '19

08 Feb '19

Cloudlflare is back to describe their latest DDoS mitigation system. Many lessons learnt. In this talk, Arthur Fabre will focus on the implementation of the Cloudflare XDP solution. Perf-based packet sampling is used to detect the attack. The followup mitigation subsystem automatically generates eBPF code in response to attacks. https://netdevconf.org/0x13/session.html?talk-XDP-based-DDoS-mitigation cheers, jamal

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0x13: Implementing the 'TCP Prague' Requirements for L4S
by Jamal Hadi Salim 08 Feb '19

08 Feb '19

Nuts-n-bolts Talk. A set of changes to DCTCP that would make it deployable over the public Internet are dubbed the 'TCP Prague requirements'. Bob Briscoe et al will introduce the important components of the first 'TCP Prague' implementation which runs on Linux. They will provide rationale and explanation on how the parts integrate together, both within each system and at Internet scale; they will outline the maturity of each component implementation, plus some points of interest and issues where decisions are still needed. https://netdevconf.org/0x13/session.html?talk-tcp-prague-l4s cheers, jamal

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0x13: Talk, IPsec encapsulation over TCP
by Jamal Hadi Salim 07 Feb '19

07 Feb '19

New accepted Nuts-n-bolts talk. Many network middleboxes either muck or block all UDP traffic; this includes IKE and IPsec. They are, however, happy to allow TCP connections through because they appear to be web traffic. Sabrina will describe to get the middle boxes happy with TCP by introducing encapsulation over standard TCP connections based on RFC 8229. She will further describe the implementation approach which utilizes existing kernel infrastructure (TCP upper layer protocol mechanism (ULP) and stream parser), and finaly how it can be used by userspace IKE daemons. https://netdevconf.org/0x13/session.html?talk-ipsec-encap cheers, jamal

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0x13: accepted talk, Performance Study of NVMe/TCP and NVMe/RoCE on Linux
by Jamal Hadi Salim 07 Feb '19

07 Feb '19

The PC has accepted another nuts-n-bolts talk. With the addition of NVMe over Fabrics (NVMe-oF) on Linux (using TCP) - there is that elephant in the room question that needs to be answered. Is there a performance impact when using TCP instead of an RDMA transport such as RoCE? Ariel Cohen has some answers. In his talk he will describe a performance study comparing NVMe/TCP to NVMe/RoCE on Linux. Throughput, latency distribution, and CPU load are measured and compared. A performance comparison of these kernel protocols to user-level protocols using SPDK will also be described. https://netdevconf.org/0x13/session.html?talk-nvme-tcp-roce cheers, jamal

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0x13: nutsnbolts talk, The Core Cost of Doing Business
by Jamal Hadi Salim 06 Feb '19

06 Feb '19

So you want to run a Linux network service and not clear how much resources you need? Don Wallwork and Andy Gospodarek will be presenting a formula for estimating the minimum number of server cores - running Linux network kernel - for a particular network service at a given rate and frame size. They will cover IPv4 and IPv6 as well and VxLAN encapsulated or tunneled traffic with the goal of understanding how the utilization of these cores impacts planning and deployment of new systems. More info: https://netdevconf.org/0x13/session.html?talk-core-cost cheers, jamal

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0x13: moonshot talk, AF_GRAFT: A new address family for containerized applications
by Jamal Hadi Salim 06 Feb '19

06 Feb '19

Ryo Nakamura believes we can take container networking to a new level. Why do we still need to use old-school virtual ports (think veth) for inter-container networking? In this talk, Ryo will introduce a new socket family, AF_GRAFT, for containers. Instead of the link between the host and container network stacks, AF_GRAFT provides a socket-layer interconnection between them. https://netdevconf.org/0x13/session.html?talk-AF_GRAFT cheers, jamal

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0x13: Nut-n-bolts workshop, Hardware Offload
by Jamal Hadi Salim 05 Feb '19

05 Feb '19

Roopa Prabhu and Or Gerlitz will co-chair the Hardware Offload workshop. The primary goal of this workshop is to discuss recent updates and futures to network hardware offload API’s and infrastructure in the Linux kernel. More info: https://www.netdevconf.org/0x13/session.html?workshop-hardware-offload cheers, jamal

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0x13: Nut-n-bolts Tutorial, XDP
by Jamal Hadi Salim 04 Feb '19

04 Feb '19

If you dont know much about XDP then your day of salvation has arrived! Two(not just one) networking Vikings[1] will be giving a hands-on tutorial on XDP. Masters Jesper Brouer and Toke Høiland-Jørgensen will not be training their students on Viking weaponry. That is a different conference. At netdev 0x13 they will be teaching you on the intricacies of XDP. The end goal of the tutorial is to walk away with enough knowledge to write your own XDP code covering your use case. The instructors will send details later on what you need to setup on what to setup on your laptop. The tutorial will cover the tooling, coding basics all the way to writing meaningful XDP applications and running them. Come and enjoy this session in person! More info: https://netdevconf.org/0x13/session.html?tutorial-XDP-hands-on cheers, jamal

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