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0x14: nutsnbolts talks, Hierarchical Token Bucket
by Jamal Hadi Salim 27 Jan '20

27 Jan '20

Hierarchial bandwith management is a very important packet service for a lot of networking use cases (ranging from large data centres to service provider use cases, etc). Over the last decade, the TC Hierarchical Token Bucket(HTB) qdisc has emerged as the most popular non-work conserving queueing discipline for enabling this service in Linux. HTB is quite flexible and versatile, but at large scale (think thousands to million flows) it comes at a cost: 1) cpu cycles predominantly due to stalls caused by shared queus lock contentions 2)extensive memory costs when adding many flows. At 0x14 we have two sessions that are addressing this issue in different ways. Our first talk is from Yosef Kuperman, Rony Efraim and Maxim Mikityanskiy and focuses on offloading HTB to the NIC hardware (Mellanox cnx5). Flow classification takes place in the TC egress clsact to avoid any sorts of (queue) locking. Packets are tagged and the offloaded HTB uses these tags as flow/classids to select the correct queue in the hierarchy. Kuperman et al will go over the challenges they overcame, show performance numbers and solicit feedback. More Info: https://netdevconf.info/0x14/session.html?talk-hierarchical-QoS-hardware-of… Our second talk is from the Google folks Stanislav Fomichev, Eric Dumazet, Willem de Bruijn, Vlad Dumitrescu, Bill Sommerfeld and Peter Oskolkov. Google has for many years utilized HTB and consequently faced scaling challenges. With the recent introduction of Early Departure Time model (See Van Jacobson's keynote on EDT in netdev 0x12), an opportunity has opened up to achieve the same packet service in a more efficient way. In this talk, Stan et al describe how they moved away from HTB altogether. The packet service is created using composition of BPF, FQ and EDT. The authors will provide performance numbers, discuss some of the outstanding challenges and solicit feedback from the community. More info: https://www.netdevconf.info/0x14/session.html?talk-replacing-HTB-with-EDT-a… Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html cheers, jamal

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0x14: New Bronze sponsor, Meter!
by Jamal Hadi Salim 26 Jan '20

26 Jan '20

We are pleased to announce Bronze sponsorship from Meter[meter.com]! Thank you for your support Meter. Meter is the easiest way to get the best Internet and WiFi for offices. Meter takes care of everything, from ISP selection and installation to ongoing support and network management. Meter combines powerful software, custom hardware, and dedicated experts to provide dramatically better Internet speed, security, and reliability. More info: https://netdevconf.info/0x14/news.html?bronze-sponsor-meter-com cheers, jamal

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0x14: nutsnbolts talk, Kernels of Splitting TCP in the Clouds
by Jamal Hadi Salim 26 Jan '20

26 Jan '20

In this talk Markuze Alex et al describe how they improved, by orders of magnitude, client download times of a global overlay network across public clouds. The overlay network known as the Pathway project (operated by VMware Research) interconnects geographical spread of public clouds and their vast compute and networking infrastructure The secret sauce? KTCP, a Kernel module running on a modified Linux Kernel which implements novel TCP splicing. Markuze and co. will discuss why their approach is different relative to the many approaches already out in the wild that implement TCP proxying. They will present numbers against classical approaches which demonstrate that KTCP is able to considerably increase the link utilization by TCP connections and reduce the connection latency close to its theoretical minimum. More info: https://netdevconf.info/0x14/session.html?talk-kernels-of-splitting-TCP-in-… cheers, jamal

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0x14: moonshot, BP4: Byte-code for Programmable Protocol-independent PDU Processing
by Jamal Hadi Salim 25 Jan '20

25 Jan '20

Tom Herbert loves moonshots and three-letter acronyms. First it was XDP and now it is BP4. In this talk, Tom will introduce BP4 - a Domain Specific Language for programmable dataplanes based on unifying the best features of eBPF and P4. The goal of BP4 is “write once, run anywhere, run well!” BP4 is intended to run in _both software and hardware_ execution environments. Central to a BP4 program is a dynamically programmable parser that supports a wide variety of protocols and permits support for new protocols to be added on the fly. The BP4 parser semantics include native support for parsing Variable Length Headers (VLH) that contains TLVs, flag-fields, or variable length arrays. Tom will describe the first PoC for BP4 which leverages the eBPF infrastructure. The PoC implements a flow dissector as a BP4 program by essentially replicating the functionality of the current Linux kernel flow_dissector with extra functionality to handle TLV and flag-fields. The programmable flow dissector will then be used as the basis for a dynamic tc-flower classification (which will allow protocols to be programmed and dynamically added for tc-flower processing). More info: https://netdevconf.info/0x14/session.html?talk-BP4-byte-code-for-programmab… Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html cheers, jamal

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0x14: 'Tis A TLS Festival folks!
by Jamal Hadi Salim 24 Jan '20

24 Jan '20

TLS aint cheap on the CPU. The trend on Internet traffic is indicating that the majority of internet traffic is being encrypted with TLS. In other words the most common packets are using TLS! For this reason, we need to pay more attention to TLS performance. At 0x14 we have a small TLS festival. And its all about improving performance. In the first talk, Pawel Szymanski and Manasi Deval that assert the claim that you can achive good performance by letting the CPU do its thing. Use modern CPU instructions like X86 AESNI. They run experiments that compare user-mode TLS, Kernel TLS write and kernel TLS Sendfile to contrast various bottlenecks in each one with regards to encryption and authentication, cost of system calls and the memory bandwidth. They will present their results during the talk. The talk will also provide some insight on which of the three approaches is best suited for different type of application scenarios. More info: https://netdevconf.info/0x14/session.html?talk-TLS-performance-characteriza… And in the second TLS talk, Tariq Toukan, Bar Tuaf and Tal Gilboa discuss offloading of TLS to the NIC. They start by reviewing the life cycle of a HW offloaded kTLS connection and the driver-HW interaction in order to support it. They will then present their experiments where NginX TLS activity is offloaded to the Mellanox ConnectX-6Dx NIC (using mlx5e driver). And finally, they present their experimental results which show significant performance speed-up gained by offloading kTLS operations to the HW. More info: https://netdevconf.info/0x14/session.html?talk-kTLS-HW-offload-implementati… In the third talk, Alexander Krizhanovsky and Ivan Koveshnikov continue their quest(see netdev 0x12 talk) to investigate and improve TLS handshake by moving it into the kernel (currently user space handled). In continuation from 0x12, Alexander and Ivan have been experimenting with new kernel approaches to reduce some perf culprits involved in completing a TLS handshake, namely dynamic memory allocation and big integer initialization. They will present their results which quantify the new approach. The talk will cover many other perf topics related to TLS handshake. More info: https://netdevconf.info/0x14/session.html?talk-performance-study-of-kernel-… Reminder, registration is now open and early bird is still in effect. https://netdevconf.info/0x14/registration.html cheers, jamal

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0x14, Registration open!
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Sorry, resend to fix the hotel link.. We are pleased to announce the opening of registration for Netdev 0x14. Netdev 0x14 conference will be held in downtown Vancouver, Canada March 17-20, 2020 at the Pinnacle Hotel Harbourfront https://www.pinnacleharbourfronthotel.com We took your feedback from 0x13 and made some changes: - the conference is now 4 days (instead of 3). - From day 2 onwards we are going to experiment with breakout rooms. Instead of infinite _great talks_, we are introducing break out sessions. Attendees interested in specific discussions, after a talk or otherwise, can grab an available break out room and have more discussions. We are still deciding on the exact schedule for the break outs. - Having lunch at the location proved very good for the schedule and the collaboration. So we will be feeding you, again. Our main motivation is to bring the community together to the idea-exchange fountain we call Netdev conf. Since this is now a 4 day event - our costs have gone up. We do not aim to make profit from the event; however, to recoup some of the cost we have raised our registration fee. Cost is: CDN $475 for early bird registration which expires on February 17th 11:59PM Eastern time. Starting Feb 17th onwards, the price goes up to CDN $575. Students are 50% off (ID required) More details on registration: https://www.netdevconf.info/0x14/registration.html If you need financial assistance, note that we do provide bursaries (but slightly constrained this time): https://www.netdevconf.info/0x14/bursaries.html If you need a visa to attend and need an invitation letter, please dont procrastinate and contact us at: registrar(a)netdevconf.info more info at: https://www.netdevconf.info/0x14/travel.html cheers, jamal _______________________________________________ people mailing list people(a)netdevconf.org https://lists.netdevconf.info/cgi-bin/mailman/listinfo/people

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0x14, Registration open!
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

We are pleased to announce the opening of registration for Netdev 0x14. Netdev 0x14 conference will be held in downtown Vancouver, Canada March 17-20, 2020 at the Pinnacle Hotel Harbourfront https://pinnacleharbourfronthotel.com We took your feedback from 0x13 and made some changes: - the conference is now 4 days (instead of 3). - From day 2 onwards we are going to experiment with breakout rooms. Instead of infinite _great talks_, we are introducing break out sessions. Attendees interested in specific discussions, after a talk or otherwise, can grab an available break out room and have more discussions. We are still deciding on the exact schedule for the break outs. - Having lunch at the location proved very good for the schedule and the collaboration. So we will be feeding you, again. Our main motivation is to bring the community together to the idea-exchange fountain we call Netdev conf. Since this is now a 4 day event - our costs have gone up. We do not aim to make profit from the event; however, to recoup some of the cost we have raised our registration fee. Cost is: CDN $475 for early bird registration which expires on February 17th 11:59PM Eastern time. Starting Feb 17th onwards, the price goes up to CDN $575. Students are 50% off (ID required) More details on registration: https://www.netdevconf.org/0x14/registration.html If you need financial assistance, note that we do provide bursaries (but slightly constrained this time): https://www.netdevconf.org/0x14/bursaries.html If you need a visa to attend and need an invitation letter, please dont procrastinate and contact us at: registra(a)netdevconf.org more info at: https://www.netdevconf.org/0x14/travel.html cheers, jamal

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0x14: Workshop, Netfilter
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Pablo Neira Ayuso will chair a netfilter workshop that will cover updates in the Netfilter land since the last NetDev conference such as: * Summary of asorted updates. * Updates on the next generation packet classification framework. * Connection tracking support for bridge. * Hardware offloads. More info: https://netdevconf.info/0x14/session.html?workshop-netfilter cheers, jamal

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0x14: New workshop, Hardware acceleration and offload
by Jamal Hadi Salim 23 Jan '20

23 Jan '20

Tom Herbert will chair a workshop on hardware acceleration and offload in Network Interface Cards. Tentative agenda for the workgroup include the following topics: - New work in checksum and segmentation offloads - TC flower offload - XDP hints - XDP/eBPF offload - Receive packet steering - Netfilter offload - OVS offload - Application specific hardware queues More info: https://netdevconf.info/0x14/session.html?workshop-hardware-acceleration-an… cheers, jamal

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congestion control in the bufferbloated age
by Dave Taht 22 Jan '20

22 Jan '20

I am unsure if I will make netdevconf this year, as increasingly interesting as the agenda seems. Might make it, might not. my talk at linux.conf.au last week was quite droll with lots of funny bits, and perhaps next year y'all might enjoy something like it, instead of something more serious? https://blog.apnic.net/2020/01/22/bufferbloat-may-be-solved-but-its-not-ove… I figure this time next year writing something more serious will be feasible as the l4s vs sce debate will have settled, and I'll plan on that. -- Make Music, Not War Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-435-0729

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0x14: Tutorial, How to add AF_XDP zero-copy support to drivers
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

AF_XDP is a relatively new technology optimized for high performance packet processing. It provides an abstraction over hardware rings, so the application can handle packets in a low-level, yet hardware-agnostic fashion. With conforming drivers, AF_XDP also provides zero-copy packet handling capabilities to the application. At its basic level AF_XDP works works fine with a lot of conforming drivers. Adding zero-copy support is more challenging. Maxim Mikityanskiy has been through trial-by-fire writting zero copy AF_XDP support and came out unscathed. In this tutorial, Maxim instructs on how a driver author would go about adding AF_XDP zero copy support using the mlx5e driver as an example. More info: https://netdevconf.info/0x14/session.html?tutorial-adding-AF_XDP-zero-copy-… cheers, jamal

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0x14: nutsnbolts talk, NVMe-over-TCP ≈ NVMe-over-RDMA
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

Networks are getting faster but so is storage. It is not uncommon anymore for a single high performance storage device to deliver as much as a million read/write operations per second. For traditional remote storage accesses CPU requirements have become unsustainable. The recently merged NVMe-over-TCP has improved performance lowering CPU utilization. However, despite of its advantages of being able to use commodity NICs, NVMe-over-TCP's performance is still significantly worse than NVMe-over-RDMA. Rachit Agarwal, Qizhe Cai, and Jaehyun Hwang have some new ideas on how to significantly improve the status quo. They will discuss a design, implementation and evaluation of several new ideas within NVMe-over-TCP. Their design maintains all the desirable properties of NVMe-over-TCP (unmodified applications, unmodified TCP/IP stack, etc.), and yet, saturates a 100Gbps link for remote accesses using CPU utilization _similar to state-of-the-art user-space and RDMA-based solutions_. More information: https://bit.ly/2Ri6hJd cheers, jamal

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0x14: nutsnbolts talk, Hardware Acceleration of Container Networking Interfaces
by Jamal Hadi Salim 22 Jan '20

22 Jan '20

In this talk Amritha Nambiar, Sridhar Samudrala, and Kiran Patil will discuss the current approaches used in offloading of container network interfaces. The talk will cover macvlan, ipvlan and subdevice functions in addition to some of the newly proposed generic interfaces to create virtual interfaces from a parent pci device. Challenges and limitations of the different approaches as well new ideas will be discussed. More information: https://www.netdevconf.info/0x14/session.html?talk-hardware-acceleration-of… cheers, jamal

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0x14: Tutorial, Programming QUIC
by Jamal Hadi Salim 21 Jan '20

21 Jan '20

So you've heard of this new shiny transport called QUIC. You've even been to several presentations on QUIC at 0x12 and 0x13. And you are wondering how to write applications that run using QUIC transport. Or ... maybe you happen to know that if you pulled apart the Chromium tree and perform some tooling kungfu you could get QUIC infra sufficient for you to write a client or a server... Dmitri Tikhonov has a better idea. Why dont you show up in Vancouver for 0x14? He will be giving a tutorial on how to write applications on top of HTTP/3 QUIC based on the lsquic library. The tutorial will be instructor-led and will start with a (very) short QUIC and HTTP/3 basics introduction followed with a delve into the innards of the lsquic library and leading to interactive coding of simple echo server and client programs. And, of course more.. All the demoed code will be made available on github. More info: https://bit.ly/30HDNvy cheers, jamal

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0x14: moonshot talk, Complex Network Services With eBPF
by Jamal Hadi Salim 21 Jan '20

21 Jan '20

The PC has accepted another moonshot talk! eBPF is great, but: unfortunately it gravitates to the appliance world model (lumping data and control in one pile) - which is ideal for solving simple one-off business problems. Writing complex network services with eBPF is a lot more painful. In this moonshot talk, Sebastiano Miano et al introduce the Polycube project that eases ability to write complex network services with eBPF. Polycube network services have an architecture that moves away from the appliance model by separating data from control and management plane. With its model-driven architecture, Polycube exposes REST APIs for service management. This talk will go into some detail of the Polycube APIs and abstractions and then illustrate the power of Polycube with a small live demo. More information: https://bit.ly/2NM9fDL cheers, jamal

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0x14: Transport workshop
by Jamal Hadi Salim 20 Jan '20

20 Jan '20

Neal Cardwell, Yuchung Cheng and Soheil Hassas Yeganeh will chair the Transport workshop. The workshop will have many discussions on current topics in transport-layer issues in the kernel, including (but not limited to): - different protocols in the Linux kernel: TCP, MPTCP, SCTP, ... - congestion control, loss recovery, and protocol improvements - new development, performance work, measurement, real-world production experience - eBPF integration with the transport layer - etc The workshop will consist of slide presentations and extended group discussions. More information: https://netdevconf.info/0x14/session.html?workshop-transport cheers, jamal

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0x14: XDP workshop
by Jamal Hadi Salim 20 Jan '20

20 Jan '20

Saeed Mahameed will chair the netdev 0x14 XDP workshop. Many discussions on a variety of XDP issues will take place - including follow ups on outstanding challenges, updates on existing features and new ideas on a variety of topics ranging from performance, acceleration and many more. Come and be part of the discussions. Current Workshop agenda (subject to update) includes: - XDP HW metadata hints - XDP on hosts pain points summary - XDP egress, development status and use case - Page pool skb recycling - Performance gains seen with iommu - Death-by-a-thousand-paper-cuts parable (related to XDP!) - etc More information: https://netdevconf.info/0x14/session.html?workshop-XDP cheers, jamal

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0x14: Talk Accepted, Test Your Limits With TRex Traffic Generator
by Jamal Hadi Salim 19 Jan '20

19 Jan '20

The Program Committee has accepted another nutsnbolts talk. So you have 100Gbps port and you want to do high performance network testing for your shiny new Linux kernel feature.... Folks, your options are pretty much limited to expensive, commercial equipment(we are talking hundreds of thousands of $$). Or you could use Trex. Come and hear Hanoh talk about Trex. Trex leverages COTS x86/ARM servers and most modern physical NICs. What can Trex do for your perfomance testing? - generate upto 200gbps/100mpps advance traffic pattern - millions of real world tcp/udp flows both stateful and stateless for testing packet forwarding and end servers. - Millions of Connection/s (CPS) for flows - etc Hanoh will share the experiences they gained when writting Trex that apply to scaling Linux networking; he hopes to inspire some of the techniques to be adopted in Linux. More info: https://netdevconf.info/0x14/session.html?talk-test-your-limits-with-trex-t… cheers, jamal

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0x14: Invitation letters
by Jamal Hadi Salim 19 Jan '20

19 Jan '20

Hi, Apologies again because we are unusually late opening registration this time. We are temporarily changing our policy for issuing invitation letters. Typically we request you register before we issue a letter. This time, starting now, up to the moment registration opens you can request for the invitation letter. Send email to registrar(a)netdevconf.info for invitation letter requests. cheers, jamal

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0x14: Gold Sponsor! Google
by Jamal Hadi Salim 18 Jan '20

18 Jan '20

We are pleased to announce Google as a Gold sponsor for Netdev 0x14. Google believes that open source is good for everyone. By being open communities deliver enterprise-grade, open source software-defined infrastructure and application delivery solutions backed by superior service and support. More information: https://netdevconf.info/0x14/news.html?sponsor-gold-google cheers, jamal

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0x14: Talk Accepted, Evaluating BBRv2 on the Edge
by Jamal Hadi Salim 17 Jan '20

17 Jan '20

The Program Committee has accepted another nutsnbolts talk. Alexey Ivanov will discuss evaluation of TCP BBRv2 on the Dropbox Edge Network. Alexey will dissect BBR design principles and discuss whether the intended theoretical goals match real world results. He will then dig into the BBRv2 design and discuss the intended improvements over BBRv1. Eventually, using practical examples, compare the behaviors of BBRv2 vs BBRv1 vs CUBIC as applied to an edge network. More info: https://www.netdevconf.info/0x14/session.html?talk-evaluating-BBRv2-on-the-… cheers, jamal

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0x14: XDP and the cloud: Using XDP on hosts and VMs
by Jamal Hadi Salim 17 Jan '20

17 Jan '20

David Ahern will give a tutorial on integrating XDP in a cloud deployment with VMs and containers. The tutorial will interactive with source dissection and live demos (with the source code available later from github). David will look at the current state of XDP through the lens of cloud hosting, discussing the advantages, trade-offs, and limitations of using XDP on the host with the v5.4 kernel (latest LTS). This tutorial covers: - configuration of the host, - walks through an L2 forwarding program, - management of the fdb and device maps using bpftool, - simple per-VM/container ACL via eBPF, - XDP forwarding in the egress path, and - using XDP in VMs running on the host. More info: https://netdevconf.info/0x14-staging/session.html?tutorial-XDP-and-the-cloud cheers, jamal

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0x14: Bronze Sponsor, Mojatatu!
by Jamal Hadi Salim 16 Jan '20

16 Jan '20

Mojatatu has been a solid supporter of the Netdev conference since 0.1! We appreciate their support and welcome them back as a Bronze Sponsor for Netdev conf 0x14. https://www.netdevconf.org/0x14/news.html?bronze-sponsor-mojatatu-networks cheers, jamal

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0x14: updates on CFS and registration
by Jamal Hadi Salim 16 Jan '20

16 Jan '20

Hi, Two announcements: 1) CFS closed last night. We are not re-opening. The PC is dilligently reviewing the large number of very exciting submissions we have received. Given the amount of submissions - we are moving the final accept/reject decisions from the 20th Jan to 1st of February. If you submitted and dont get a a response or feedback by the 20th, please bear with us. 2) We are trialing new registration software. Our original plan was to open up registration by the 10th of January. The new setup is still undergoing testing. We plan to open it up as soon as possible and will update you. As you all know - we _never_ close our registration. So fear not that there is a spot for you. cheers, jamal

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0x14: First Talk Accepted, SONiC and Linux
by Jamal Hadi Salim 13 Jan '20

13 Jan '20

The Program Committee has accepted the first nutsnbolts talk. In this talk, Guohan Lu and Matty Kadosh are going to introduce SONiC, a Linux based open source NOS (https://azure.github.io/SONiC/). They will discuss the SONiC architecture, its integration with FRR and kernel routing stack and the current status of SONiC. They will go over some of the challenges they faced and how they resolved them and then further discuss outstanding issues in Linux Networking that the SONiC community is still facing. More importantly, the SONiC community will take this opportunity to provide feedback to the Linux Networking community as well as solicit feedback on outstanding challenges. More info: https://netdevconf.info/0x14/session.html?talk-sonic-and-linux cheers, jamal

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