June 2024 - people - netdevconf.info

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 11 Jun '24

11 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 10 Jun '24

10 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 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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