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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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