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tcp: HPTS performance enhancements

Description

tcp: HPTS performance enhancements

HPTS drives both rack and bbr, and yet there have been many complaints
about performance. This bit of work restructures hpts to help reduce CPU
overhead. It does this by now instead of relying on the timer/callout to
drive it instead use user return from a system call as well as lro flushes
to drive hpts. The timer becomes a backstop that dynamically adjusts
based on how "late" we are.

Reviewed by: tuexen, glebius
Sponsored by: Netflix Inc.
Differential Revision: https://reviews.freebsd.org/D31083

Details

Provenance
rrsAuthored on Jul 6 2021, 7:23 PM
Reviewer
tuexen
Differential Revision
D31083: tcp: HPTS performance enhancements.
Parents
rG747a6b7ace3d: cloudabi and linux ABIs: do not call umtx_thread_cleanup() from thr_exit syscall
Branches
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Tags
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