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0x18 talks: TCP related talks
by Jamal Hadi Salim 14 Jun '24

14 Jun '24

Maryam Ataei Kachooei, Joshua Chung, Amber Cronin, Benjamin Peters(a)viasat.com, Feng Li, Jae Won Chung and Mark Claypool talk about a new TCP slow start algorithm SEARCH(Slow start Exit At Right CHokepoint). The authors state that with SEARCH they resolved challenges in wireless links with premature exits from slow start. They will share their kernel changes and results on experiments on WiFi, 4G/LTE, and low earth orbit (LEO) and geosynchronous (GEO) satellite links. More info: https://netdevconf.info/0x18/1 John Ousterhout asks a question: Is it OK to Hijack TCP? John notes that TCP already has all kinds of classical goodies built into the HW offload infrastructure, example TSO, HW GRO, checksum, etc and he wants to take advantage of them. He proposes to masquerade HOMA as TCP on the sender and then disambiguating at the receiver. Come give him some feedback More info: https://netdevconf.info/0x18/19 Amery Hung and Xiaochun Lu will discuss Fine-grained tuning of TCP. Amery and Xiaochun observe that increasing link speeds are inducing the growth of number of flows seen on the wire, with a mix of long or short flows. Unfortunately traditional CC algos like CUBIC favor long flows which conflicts with application desires for throughput and latency. The authors discuss the techniques they use to address these challenges. More info: https://netdevconf.info/0x18/25 cheers, jamal

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0x18 talk: State of the union in TCP land
by Jamal Hadi Salim 13 Jun '24

13 Jun '24

Monsieur Eric Dumazet will give the classical State of the union in TCP land talk. It is rumored (I cant confirm or deny this!) that the Ninja may descend into the conference from the rooftop. Come and join in this enlightening talk! cheers, jamal

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0x18 talks: Performance enhancements and analysis
by Jamal Hadi Salim 13 Jun '24

13 Jun '24

Zijian Zhang, and Xiaochun Lu will present a talk on "a new lightweight Zero-Copy Notification Mechanism". Zijian and Xiaochun improve usability over MSG_ZEROCOPY as well achieve a 7% improvement over MSG_ZEROCOPY with TCP. This session will dive into technical implementation, challenges overcome, and the implications for future zerocopy network application development. More info: https://netdevconf.info/0x18/14 Nabil Bitar, Jamal Hadi Salim, and Pedro Tammela will present a talk titled "Drinking From The Host Packet Fire Hose" D/IPUs have been introduced to deal with high speed (1-800 Gbps ports). The authors look at such devices from a host perspective and present brief data on the offload improvements and more focused analysis of traditional performance improvement techniques (ZC, TSO, etc) and argue that we need to have a symbiosis of traditional approaches with the new offloads. More info: https://netdevconf.info/0x18/5 Joe Damato will give a talk titled "Real world tips, tricks, and notes of using epoll-based busy polling" Joe will share his experience on using epoll-based busy polling. He say that it has gotten easier with per-epoll context basis, but using it is still tricky without doing a deeper dive of the kernel networking code. Come and learn from Joe how to make use of this exciting feature. More info: https://netdevconf.info/0x18/10 cheers, jamal

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0x18 talk: Introduction to Falcon Reliable Transport
by Jamal Hadi Salim 12 Jun '24

12 Jun '24

Yadong Li, Jay Bhat, Nandita Dukkipati, Chen Zhao, Neelesh Bansod, Shiraz Saleem and Anjali Singhai Jain will give a talk on the Falcon Reliable Transport. What is Falcon you ask? It is a HW offloaded reliable transport designed by Google and published to satisfy demanding workloads that require high burst bandwidth, high message rates, and low latency. Massive-scale AI/ML training and high performance computing (HPC) have driven the demand for offloading. Falcon incorporates years of learnings in traffic shaping, congestion control, load balancing, and more all integrated into offload. More info: netdevconf.info/0x18/43 cheers, jamal

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0x18 BoFs: 3 more BoFs
by Jamal Hadi Salim 12 Jun '24

12 Jun '24

Willem de Bruijn, Jakub Kicinski, Mina Almasry, Shailend Chand, David Wei and Pavel Begunkov will run a BoF on Devmem TCP & io uring zero copy More Info: netdevconf.info/0x18/36 Anndrew Lunn will run a BoF on Netdev Processes, Community, and Respect/Reputation More info: netdevconf.info/0x18/38 Jakub Kicinski will run a BoF on Netdev Testing & Automation More info: netdevconf.info/0x18/29 cheers, jamal

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0x18 talk: Multi-PF single netdev
by Jamal Hadi Salim 10 Jun '24

10 Jun '24

Tariq Toukan will discuss creating multiple PFs for a single NIC in a multi-socket server, each with its own PCIE interface. Why do we need this you ask? Imagine a NUMA machine... you plug in a NIC.... as it sits today, the NIC gets connected on one of the NUMA nodes. If your application is running/scheduled on a different numa node then network traffic traverses over the internal bus between the sockets. The consequences are observed as significant latency, CPU utilization, and decreased network throughput. In this talk Tariq describes the Multi-PF technology under the Nvidia netdev driver which overcomes these challenges. The Multi-PF approach enables several CPUs within a multi-socket server to connect directly to the network, each through its own dedicated PCIe interface. For more information: netdevconf.info/0x18/24 cheers, jamal

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0x18 talk: PSP Crypto Protocol and HW Offload
by Jamal Hadi Salim 10 Jun '24

10 Jun '24

Arun Acharya, Anjali Singhai Jain, and Willem de Bruijn will give a talk on PSP. PSP is a security protocol that incorporates lessons from experiences with currently deployed L2, L3 and L4 crypto protocols. PSP, originally developed and deployed at Google, shares many concepts with IPSEC and is encapsulated in UDP to avoid network issues with less common IP protocols. PSP is purposely built to scale. It does not store an explicit SA in the ingress direction, but generates the ingress key on NIC from a device master key, combined with the SA SPI embedded in the packet. The full PSP Crypto Protocol Specification can be found at https://github.com/google/psp/doc Arun, Anjali and Willem will give an introduction to PSP and then dig further into PSP NIC hardware offload For more info: netdevconf.info/0x18/35 cheers, jamal

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0x18 bronze sponsor, Viasat
by Jamal Hadi Salim 10 Jun '24

10 Jun '24

We welcome first time sponsor, Viasat with a bronze sponsorship. Thank you Viasat! Who is Viasat? Viasat is a global communications company that connects people, businesses, governments, and communities through satellite broadband services and secure networking systems. Viasat brings affordable, high-quality connectivity to land, air, sea – and beyond, and ensures people on-the-go have access to the same quality of internet as they have at home. cheers, jamal

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0x18 talk: benefits and drawbacks of syscall hooks
by Jamal Hadi Salim 09 Jun '24

09 Jun '24

System call intercepting is a common trick used in networking to extend or add new features and is commonly used by kernel emulators (user mode linux, or gvisor) and network libraries which offer replacement or extra massaging of for example socket API. The one big advantage provided by such schemes eg using LD_PRELOAD is you dont have to modify the application code. Hajime Tazaki and Kenichi Yasukata look a the history of this syscall hook approach, how the functionalirt has been improved over time. They will discuss outstanding challenges and how we can move forward in future to make this area even more appealing. cheers, jamal

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0x18 talk: Linux networking on s390 architecture - Is it very different?
by Jamal Hadi Salim 09 Jun '24

09 Jun '24

Alexandra Winter and Niklas Schnelle will demystify the S390 for us. To some(including yours truly), the s390 is probably the most mysterious Linux architecture. As someone who has been around this neighborhood for a while, the most sticky knowledge i have of the s390 is it was doing virtualization way before virtualization was cool and existed in open source! Alexandra and Niklas say thatin many ways the s390 is just another processor architecture but it is indeed speacial when it comes to I/O and networking. The authors will break down for us the multiple levels of Hipervisors and IO-virtualization. About sharing resources with non-Linux systems. About network cards that are not attached via PCI. About network interfaces that are implemented in Hardware, Firmware or Hypervisor software and protocols that serve special purposes or predate ethernet. This talk will be an eye opener - i hope you are all looking forward to it as i do! cheers, jamal

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0x18 Talk: Scheduling HTTP streams
by Jamal Hadi Salim 08 Jun '24

08 Jun '24

In this talk Evgeny Mekhanik, Konstantin Tatar and Alexander Krizhanovsky assert that you need a very efficient stream scheduling mechanism to handle a busy web server which manages millions of TCP connections, each potentially containing hundreds of HTTP/2 or HTTP/3 streams. Additionally such a scheme must be resilient to DoS attacks. In this talk they will go over the different approaches taken by servers such Nginx, H2O, nghttp2 (Envoy, Apache HTTPD) and then compare them against their work with Tempesta FW. For more info: netdevconf.info/0x18/12 cheers, jamal

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0x18 Talk: Achieving linear CPU scaling in WireGuard with an efficient multi-tunnel architecture
by Jamal Hadi Salim 08 Jun '24

08 Jun '24

In this talk, Mirco Barone, Federico Parola, Fulvio Risso and Davide Miola dig deep into the scaling challenges of Wireguard on multicore systems. They identify existing bottlenecks and propose an architecture which linearly scales wireguard throughput by incrementally adding more cores. The authors approach to scaling wireguard doubles the performance of vanilla wireguard multi-tunnel setup as well as 18x throughput improvement on a single tunnel setup. For more info: netdevconf.info/0x18/23 cheers, jamal

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0x18 Talk: Innovation from Within: The Story of Meta's Host Network Interface and fbnic Driver
by Jamal Hadi Salim 07 Jun '24

07 Jun '24

Alexander Duyck will talk about Meta's Host Network Interface (HNI) and its accompanying Linux driver called fbnic. Why would Meta build their own NIC instead of picking one from the menu of vendors? How is it different from a NIC you can get off a shelf somewhere? All good questions. Join the conference and hear it all from Alex! For more info: netdevconf.info/0x18/20 cheers, jamal

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0x18: Talk, Characterizing IOTLB Wall for Multi-100-Gbps Linux-based Networking
by Jamal Hadi Salim 06 Jun '24

06 Jun '24

New talk from Alireza Farshin and Luigi Rizzo. NIC link speeds are moving quickly toward the 1 Tbps per-port range and higher! These speed increases open up newer bottlenecks in the communication between system components ( i.e PCIe bus, address translation (IOMMU), memory fabric, and memory chips) that we never had to worry about at lower speeds. In this talk Alireza and Luigi focus on the IOMMU and the associated IOTLB contributions to the new bottlenecks. The IOTLB size tends to be small and depending on the pattern of IO requests, it is possible to overflow the cache and cause a dramatic drop in performance. The authors refer to this threshold phenomena as the "IOTLB wall". For instance, the buffer management (e.g., PagePool API in the Linux kernel) and various offloading capabilities of modern NICs (e.g., LRO and TSO) could affect the memory request pattern, and consequently the number of IOTLB misses. Alireza and Luigi describe the IOTLB behavior and its effects on recent Intel Xeon Scalable & AMD EPYC processors at 200 Gbps, by analyzing the impact of different factors contributing to IOTLB misses and causing a throughput drop. The authors then proceed to prescribe how the problem can be mitigated with various techniques. More info: netdevconf.info/0x18/7 cheers, jamal

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0x18: media sponsor, LWN
by Jamal Hadi Salim 04 Jun '24

04 Jun '24

Hi, The premier news and information source for the free and open source software community, Linux Weekly News(https://lwn.net/) is back as the media sponsor for the netdev conference. We thank them, again! cheers, jamal

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0x18: 6 New Workshops!
by Jamal Hadi Salim 03 Jun '24

03 Jun '24

We are pleased to announce 6 workshops that will take place at 0x18. Steffen Klassert will chair the IPsec workshop https://netdevconf.info/0x18/sessions/workshop/ipsec-workshop.html Tom Herbert will chair a Workshop on Extension Headers https://netdevconf.info/0x18/sessions/workshop/workshop-on-extension-header… David Ahern and Alexander Duyck will chair the Driver and H/W APIs Workshop https://netdevconf.info/0x18/sessions/workshop/driver-and-hw-apis-workshop.… Pablo Neira Ayuso will chair the Netfilter Mini workshop https://netdevconf.info/0x18/sessions/workshop/netfilter-mini-workshop.html Jamal Hadi Salim will chair the TC workshop https://netdevconf.info/0x18/sessions/workshop/tc-workshop.html cheers, jamal

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0x18: Last day of early bird registration
by Jamal Hadi Salim 03 Jun '24

03 Jun '24

... that is today, folks... cheers, jamal

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0x18: secunet, Bronze Sponsor!
by Jamal Hadi Salim 03 Jun '24

03 Jun '24

We are pleased to welcome back friends of the conference, secunet, as a bronze sponsor for Netdevconf 0x18! secunet is a long time supporter. We are grateful for their continued support. So who is Secunet? secunet(https://www.secunet.com/) is Germany’s leading cybersecurity company. In an increasingly connected world, the company’s combination of products and consulting assures resilient digital infrastructures and the utmost protection for data, applications and digital identities. secunet specialises in areas with unique security requirements – such as cloud, IIoT, eGovernment and eHealth. With security solutions from secunet, companies can maintain the highest security standards in digitisation projects and advance their digital transformation. secunet is an IT security partner to the Federal Republic of Germany and a partner of the German Alliance for Cyber Security. cheers, jamal

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0x18: BoF, My Fu is Better Than Yours!
by Jamal Hadi Salim 01 Jun '24

01 Jun '24

Back by popular demand! Started at NetDev 0x17, it was such a big hit, so much so that PJ wants to do it again! This BoF is a free-form, guilt-free, open collaboration forum for people to come and share their cool hacks, development flows, testing flows, or whatever else seems neat that you want others to see. Open sharing of these ideas can help someone optimize their own workflows, or you can optimize yours by hearing feedback or input on yours! Come and partake in this fun session! Rumor has it even Jamal may gather the courage to go on stage this time!! If you missed the last one, watch the video: https://youtu.be/D7YBDQiR2X4 cheers, jamal

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0x18: Tutorial, Introduction to PTP on Linux - APIs
by Jamal Hadi Salim 31 May '24

31 May '24

Maciek Machnikowski will be conducting a tutorial to introduce us to the Linux APIs and associated infrastructure for PTP. Maciek will dig into the fundamentals for understanding the different components that are essential for time synchronization and how they work together to achieve accurate time synchronization. Come join him and learn how to achieve precise time synchronization easily. More details: https://netdevconf.info/0x18/sessions/tutorial/introduction-to-ptp-on-linux… cheers, jamal

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0x18: Tutorial, PTP from scratch
by Jamal Hadi Salim 30 May '24

30 May '24

In this exciting interactive tutorial, our esteemed instructors, Milena Olech and Maciek Machnikowski will teach you how to create and implement a driver for a PTP Hardware Clock (PHC) and link it with a network device capable of hardware timestamping. Milena and Maciek will use the netdevsim driver to drop some hands-on knowledge with the process and insights into enabling the PHC and implementing the PTP-related kernel APIs. More details: https://netdevconf.info/0x18/sessions/tutorial/tutorial-ptp-from-scratch.ht… cheers, jamal

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0x18: Gold Sponsor, Jump Trading!
by Jamal Hadi Salim 29 May '24

29 May '24

We are very pleased to welcome _back_ Jump Trading Group as a Gold sponsor for Netdev conf 0x18! Thank you for your support! Jump Trading Group(https://www.jumptrading.com/) is a research-based electronic trading firm with 1,500+ employees and over a dozen offices across the globe. Founded in the trading pits of Chicago in 1999, Jump's continued success is driven by partnering sophisticated quantitative research with bleeding-edge technology to trade the global markets. Jump's culture is unique. Constant innovation requires fearlessness, creativity, intellectual honesty, and a relentless competitive streak. They research, design, develop, and deploy technologies that constantly change their world, fund startup-ups across industries, and partner with global research organizations and universities to continue solving problems. cheers, jamal

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0x18: Registration open!
by Jamal Hadi Salim 28 May '24

28 May '24

Folks, Registration for 0x18 is now open! https://netdevconf.info/0x18/registration cheers, jamal

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testing email delivery
by Lael Santos 23 May '24

23 May '24

Hi everyone people have been informing us of a huge delay in email delivery for this mailing list. We've made some changes and tweaks that should solve the problem. If you identify this email has reached you after the 23rd of May please ping me directly. Thank you! -- Regards Lael N. Santos

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0x18: Platinum Sponsor, ByteDance!
by Jamal Hadi Salim 21 May '24

21 May '24

We are pleased to welcome back ByteDance as Platinum sponsors for Netdev conf 0x18. Thank you for your continued support Bytedance! Founded in 2012, ByteDance's mission is to inspire creativity and enrich life. With a suite of more than a dozen products, including TikTok, Helo, and Resso, as well as platforms specific to the China market, including Toutiao, Douyin, and Xigua, ByteDance has made it easier and more fun for people to connect with, consume, and create content. See: https://www.bytedance.com/ cheers, jamal

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