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Fast UDP I/O for Firefox in Rust

6 hours ago
https://max-inden.de/post/fast-udp-io-in-firefox/
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  • #QUIC
  • #UDP
  • #Firefox
  • Firefox's HTTP/3 traffic uses QUIC over UDP, accounting for 20% of its HTTP traffic.
  • NSPR, Firefox's network I/O library, uses outdated UDP APIs like PR_SendTo and PR_RecvFrom.
  • Modern OS features like sendmmsg, recvmmsg, GSO, and GRO offer performance improvements for UDP I/O.
  • Firefox's QUIC UDP I/O stack was rewritten in Rust for performance and security, leveraging quinn-udp.
  • Performance improvements include throughput increases from <1Gbit/s to 4Gbit/s in CPU-bound scenarios.
  • Platform-specific challenges were encountered, such as issues with Windows' USO/URO and Android's socketcall.
  • Linux benefits the most with mature support for GSO/GRO, while macOS lacks segmentation offloading.
  • ECN support was improved, with 50% of QUIC connections in Firefox Nightly using ECN-capable paths.
  • Future work includes resolving Windows USO/URO issues and continuing OS/driver improvements for QUIC.
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