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Re:Boosting upload speed and improving Windows' TCP stack by dochtman on Tuesday May 18, 2021 @04:47PM (#27200849)
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.)

Re:Boosting upload speed and improving Windows' TCP stack by leadbase0 on Tuesday May 18, 2021 @05:54PM (#27201764)
QUIC is a protocol... "...CCA in userspace" CCA stands for congestion control algorithm.