Attendees: glebius@, peterlei, rrs@, rscheff@, tuexen@

• Unloading CC requires specific lock orders and pushes constraints on the fast path. rrs@ adds using reference counting for removing an CC module in 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. Discussion has been started on net@.

• D33035 will be updated with respect to the draft-ietf-tcpm-hystartplusplus-04. rscheff@ will review.

• D33979 seems to address the problem reported earlier by rscheff@. It as suggested to separate out unrelated changes and it was discussed how to avoid such mistakes in the future. Therefore the current semantics of the flag will be documented.

• Some usages of ticks in the TCP stack might result in strange behaviour. Using ticks should be avoided…

Next meeting: 10 February 2022 @ 1500 UTC