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0x13: Moonshot, Implementing the Next Generation of Network Telemetry Technologies
by Jamal Hadi Salim 17 Feb '19

17 Feb '19

Telemetry is now an important part of networking. Standards and proposals for producing and consuming metadata are emerging. In this talk, Andy Gospodarek will introduce two such standards: INT and IFA. He will describe the hardware requirements and implementation challenges. He will propose approaches for configuring INT/IFA for the kernel and supported hardware which attempts to minimize risk associated with deploying early specs. More info: https://www.netdevconf.org/0x13/session.html?talk-nextgen-telemetry Gentle 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, Accelerating QUIC via Hardware Offloads Through a Socket Interface
by Jamal Hadi Salim 15 Feb '19

15 Feb '19

QUIC is gaining a lot of momentum. Given QUIC implementations are in user space it is challenging to benefit from kernel-based offloads (which protocols like TCP get for free). Joshua Hay et al propose an interface to support hardware offloads used by QUIC such as cryptography and transmit segmentation. In this talk they will describe their implementation and propose APIs similar to KTLS. They will also present performance measurements and results using the chromium QUIC implementation. They hope to receive feedback and proceed to the next steps. More info: https://netdevconf.org/0x13/news.html?talk-quic-offload A gentle 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: Tutorial, De-mystifying the networking relationship with Kubernetes
by Jamal Hadi Salim 14 Feb '19

14 Feb '19

For those of you container-curious, this is an opportunity to learn about how Linux networking and containers work together in Kubernetes. Mike Cambria will give a tutorial on networking Linux Containers using the Container Network Interface (CNI) and Kubernetes (k8s). The tutorial will go from basics distinguishing the model of VM vs container networking to providing an overview of k8s and CNI; along the way Mike will bring up challenges vis-a-vis linux and the effect some of the design decisions made by k8s along with some of the solutions being proposed to address some of these challenges. More info: https://netdevconf.org/0x13/session.html?tutorial-kubernetes A gentle 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: TCP SO_TIMESTAMPING with OPT_STATS for performance analytics
by Jamal Hadi Salim 14 Feb '19

14 Feb '19

Nuts and bolts Talk. Debugging TCP session is tricky. While looking at aggregate TCP stats may help in some cases it falls short for use cases which require discovering and fixing latency issues in highly distributed applications. To cover such a use case, one would need to collect the kernel stack's point of view for the sessions lifetime. Merely using TCP_INFO doesnt cut it for use cases when we need to see more fine grained details for each message such as is the case for structured RPC request and response interactions. In this talk, Soheil Hassas Yeganeh and Yuchung Cheng will show how to address these issues using timestamps to track individual messages in the kernel. As a crucial extension, they will show how we to accurately capture the state of TCP using OPT_STATS for individual messages. Further, they enumerate challenges, shortcomings and gotchas of kernel timestamps when deployed at scale. More info: https://netdevconf.org/0x13/session.html?talk-tcp-timestamping 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: 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 13 Feb '19

13 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 13 Feb '19

13 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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