February 2019 - people - netdevconf.info

0x13: Keynote Speaker - Alissa Cooper
by Jamal Hadi Salim 26 Feb '19

26 Feb '19

We are pleased to announce our Netdev 0x13 keynote speaker: Alissa Cooper Alissa Cooper is the Chair of the Internet Engineering Task Force (IETF). She has served on many roles at the IETF including on the Internet Architecture Board (IAB), as an area director of Applications and Real-Time (ART), and as chair of IANA Stewardship Coordination Group (ICG). Alissa is also a fellow at CISCO and a known advocate of privacy. Alissa is going to talk about the relationship between Open Source and the IETF. Once you have a decent open source implementation, should you really care about standardization? Are open source and open standards mutually exclusive or mutually supportive? Please come hear and engage in the discussion. More info: https://www.netdevconf.org/0x13/news.html?keynote-cooper cheers, jamal

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0x13: Bronze sponsor! Red Hat
by Jamal Hadi Salim 22 Feb '19

22 Feb '19

We are pleased to announce Bronze sponsorship from Red Hat! Welcome back Red Hat! More Info: https://netdevconf.org/0x13/news.html?sponsor-bronze-redhat cheers, jamal

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0x13: schedule is up
by Jamal Hadi Salim 19 Feb '19

19 Feb '19

Ok, folks, the schedule is now up... https://netdevconf.org/0x13/schedule.html As a reminder the early bird registration ends tomorrow February 20 23:59 EST https://www.netdevconf.org/0x13/registration.html cheers, jamal

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0x13: Introducing Industry Perspective Panel
by Jamal Hadi Salim 19 Feb '19

19 Feb '19

The Industry Perspective Panel is a new session which will bring in networking industry craftsmen to discuss different topics. The primary goal is to have developers (and ops types) appreciate how Linux (networking) is used in the industry. We are not going to restrict the perspectives to be Linux only i.e a panelist does not necessarily have to use Linux in their operations, but needs to answer as to why not. The secondary goal of this session is to learn how we can do better in Linux. Both users and non-users of Linux can teach us something. The format is: - The panelist gives a presentation of their craft - questions by panelist moderator(s) - open mike to the conference At 0x13, the theme is network operations. we are looking to bring in operators of medium to large size networks of different flavors. We will be announcing them. Stay tuned. cheers, jamal

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0x13: Moonshot, The Need for Preemptive Scheduling in Microsecond-scale Systems
by Jamal Hadi Salim 17 Feb '19

17 Feb '19

That strive for microsecond-scale latencies for application level communication continues. Most purveyors of microsec solutions move datapath processing to user space so as to avoid pre-emption and have better control of latencies. Kostis Kaffes and Christos Kozyrakis argue that preemptive scheduling is infact _a good thing_. In this talk, they will describe their approach: Shinjuku Kostis and Christos will also raise the question and discuss whether these user space approaches are incrementally building full-featured operating system kernels. More info: https://netdevconf.org/0x13/session.html?talk-microsec 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, Potential IPv4 Unicast Expansions
by Jamal Hadi Salim 17 Feb '19

17 Feb '19

There is a dollar cost to IPv4 addresses: 15 to 20 a piece and that price is going up! And, no IPv6 is still not taking over the world yet. So John Gilmore, Dave Taht and Paul Wouters want to squeeze more out of that IPv4 address space. They believe there are a few hundreds of millions of addresses that can be libertated for this good cause. They have started the march to freedom for those addresses. They have some patches already accepted into the kernel and some pending for distros, vendors, routing daemons, userland tools, etc. More info: https://www.netdevconf.org/0x13/session.html?talk-ipv4-unicast-expansions 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, 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 14 Feb '19

14 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 13 Feb '19

13 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 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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people February 2019