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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 09 Jun '24

09 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 04 Jun '24

04 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 02 Jun '24

02 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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