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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 23 Jan '20

23 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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