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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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