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by wahern 313 days ago
> Google also developed QUIC, which is HTTP over UDP. There’s no longer any congestion window to deal with, so entire messages can be sent at once.

I don't think that's true. QUIC implementations typically use the same congestion control algorithms, including both CUBIC and BBR, at least nominally. The latest RFCs for those discuss use with both TCP and QUIC. Though, perhaps when used with QUIC they have more degrees of freedom to tune things.
3 comments
01HNNWZ0MV43FF 313 days ago
Also QUIC is not HTTP over UDP. HTTP/3 is HTTP over QUIC. QUIC is bidi streams and best-effort datagrams over UDP.
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Hilift 312 days ago
Vendors are pushing using QUIC and without other networking layers, thus the performance increase. For example, SMB3 over QUIC over the Internet, sans VPN.
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dlenski 312 days ago
Yeah, the article completely lost me at this point.

A somewhat-interesting, though simplistic, discussion of congestion control in TCP.

And then… "but don't worry, QUIC is magic, and it doesn't need any of this.”

No. No it's not. QUIC is not magic and it basically changes nothing in terms of congestion control.

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