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QUIC is UDP, and TCP does not use CCA in userspace.


QUIC absolutely uses congestion control. See section 6 here https://tools.ietf.org/id/draft-ietf-quic-recovery-26.html


No denying in that.


QUIC does run in user space, and also uses congestion controllers running inside the QUIC stack, in user space.

(I work on a QUIC implementation in Rust.)


QUIC is a protocol... "...CCA in userspace" CCA stands for congestion control algorithm.




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