• Randall Stewart's avatar
    tcp: HPTS performance enhancements · d7955cc0
    Randall Stewart authored
    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