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The first Media over QUIC CDN: Cloudflare

(moq.dev)
292 points kixelated | 1 comments | 22 Aug 25 18:24 UTC | HN request time: 0.205s | source
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englishm ◴[22 Aug 25 19:11 UTC] No.44988596[source]▶
Hi! Cloudflare MoQ dev here, happy to answer questions!

Thanks for the award, kixelated. xD

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ddritzenhoff ◴[22 Aug 25 22:50 UTC] No.44990875[source]▶
Hi, I've got one.

Does your team have any concrete plans to reduce the TCP vs. QUIC diff with respect to goodput [1]? The linked paper claims seeing up to a 9.8% video bitrate reduction from HTTP/2 (TCP) to HTTP/3 (QUIC). Obviously, MoQ is based on a slightly different stack, so the results don't exactly generalize. I can imagine the problems are similar, though.

(I find this stuff fascinating, as I spent the last few months investigating the AF_XDP datapath for MsQuic as part of my master's thesis. I basically came to the conclusion that GSO/GRO is a better alternative and that QUIC desperately needs more hardware offloads :p)

[1]: https://arxiv.org/pdf/2310.09423

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1. englishm ◴[23 Aug 25 07:14 UTC] No.44993984[source]▶
Good question! I can't speak concretely to our plans for optimizations at that level of the stack at this stage, but it's true that speaking broadly QUIC does currently lag behind some of the performance optimizations that TCP has developed over the years, particularly in the area of crypto where hardware offload capabilities can have a major impact.

The good news is that there are strong incentives for the industry to develop performance optimizations for HTTP/3, and by also building atop QUIC, MoQ stands to benefit when such QUIC-stack optimizations come along.

Regarding GSO/GRO - I recently attended an ANRW presentation of a paper[1] which reached similar conclusions regarding kernel bypass. Given the topic of your thesis, I'd be curious to hear your thoughts on this paper's other conclusions.

[1]: https://dl.acm.org/doi/10.1145/3744200.3744780