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FreeBSD optimizations used by Netflix serving at 800Gb/s - Drew Gallatin - EuroBSDcon 2022

EuroBSDCon · 27.8K views · 2022-10-27 · 44:05

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Overview

Netflix engineer Drew Gallatin's EuroBSDcon 2022 talk quantifies the older FreeBSD optimizations that let Netflix serve web traffic at 800Gb/s, including TSO, LRO, VM page cache zones, asynchronous sendfile and unmapped mbufs.

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HN points to it as the recorded talk behind the Netflix 800Gb/s slides and as a deep look at kernel-level optimizations for high throughput.

Recommended by 2 HN people across 2 months · HN mentions 2022–2025

Topics

Operating systems & kernelsNetworking & internet infrastructureSoftware performance & optimization
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freebsdnetflixktlstcp offloadperformancesendfile

What people said

thomasjudge · 2023-10 · Recommendation

OP mentions that "I would love to be a little mouse and peek at YouTube’s complete architecture to see how far we are from them." You can occasionally find posts -often linked here- from another player in streaming video which you might have heard of, discussing technical architecture. For example, this might be a little lower level that you may be interested in as it relates to kernel optimizations to jack bit throughput rates, but I dig this sort of thing - [VIDEO]

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notaplumber1 · 2022-11 · Recommendation

This talk was given at this years EuroBSDcon in Vienna, recording is up on YouTube. [LINK] [VIDEO] Some really great talks this year from all the *BSDs, highly recommend checking a look: [LINK]

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craftkiller · 2025-07 · Reference

Netflix discusses their reasons starting at 18:20: [LINK] tl;dw: the performance, the efficiency of development, the community, FreeBSD is a complete operating system, the code base is smaller, the ports system, and the license. and this video covers the optimizations Netflix has made to FreeBSD: [VIDEO] Also potentially a reason: According to drewg123, Linux's kTLS was broken. Which I see drewg123 also commenting in this thread. Is he the "Drew on my team" mentioned in the first video? Is he the speaker in the 2nd video? Idk [LINK]

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Sources

Video by EuroBSDCon, played through YouTube.

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