16December2021 [FreeBSD WIKI]

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Attendees: thj@, tuexen@, peterlei, rscheff@

  * rrs@ has implemented %%HyStart%%++ also for CUBIC [[https://reviews.freebsd.org/D33035|D33035]]. The patch has been updated based on latest discussions on tcpm@ietf.org. It should be committed to allow broader testing.

  * Gleb has also a fix to use the Jenkins hash for IPv4 and IPv6 based TCP connections. Phabricator review is available at [[https://reviews.freebsd.org/D33254|D33254]]. rscheff@, tuexen@ will take a look.

  * Unloading CC requires specific lock orders and pushes constraints on the fast path. rrs@ adds using reference counting for removing an CC module in [[https://reviews.freebsd.org/D33249|D33249]] and tuexen@ will write a userland application to switch CC modules on TCP connections. This tool should be able to modify on a per TCP connection grain
    * the CC module being used
    * the TCP stack being used
    * turn on and off BB logging
    * set the send and receive window

  * Gleb is suggesting to remove the compressed TCP TIMEWAIT state. The memory savings are limited, memory is not that critical anymore and it would simplify the code and allow further optimizations of the code. glebius@ will reach out to people if there are some objections. It was also discussed which information would be need to reduce the time a TCP connections stays in TIMEWAIT state. One thing he will implement is a counter how many compressed states where used at all.

Next meeting: 13 January 2022 @ 1500 UTC