27August2020 [FreeBSD WIKI]

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Attendees:  rscheff@, thj@, tuexen@

====== Discussion ======
  * tuexen discussed how to mitigate blackhole detection problems
    * tuexen@ has a review to ensure we don't do blackhole detection once we are at the minimum value [[https://reviews.freebsd.org/D24308|D24308]]; committed
    * Discussion on what should trigger blackhole detection -- full size? Or, even smaller messages which are above our min MTU? For at least IPv6, min MTU makes sense.
    * Otherwise, tuexen@'s plan remains unchanged.
    * BBR and RACK needs some modifcation
  * Discussion of [[https://reviews.freebsd.org/D24237|D24237]]: rscheff@ changed both the in-order and out-of-order data path so we call sorwakeup_locked() [when necessary] after the SACK blocks are updated. Still ongoing. rrs@ reviewed.
  * Can the TCP_STATS framework be turned on and sample no connections? Yes. thj@ will do.
  * [[https://reviews.freebsd.org/D18892|D18892]]: Upcoming: PRR
  * [[https://reviews.freebsd.org/D18985|D18985]]: Upcoming: Rescue retransmission
  * [[https://reviews.freebsd.org/D21117|D21117]]: Upcoming: Reduce counter space
  * [[https://reviews.freebsd.org/D22438|D22438]]: Upcoming: Performance improvement for after idle
  * [[https://reviews.freebsd.org/D6611|D6611]], [[https://reviews.freebsd.org/D6612|D6612]], [[https://reviews.freebsd.org/D6656|D6656]]: Get gallatin@ involved. What needs to be done to also support IPv6?
  * [[https://reviews.freebsd.org/D8253|D8253]]: rscheff@ will look into it.
  * [[https://reviews.freebsd.org/D10894|D10894]]: possibly use hystart++ instead. rrs@ will look into this later this year.
  * Should TCP Fast Open support sending of SYN segments with data and the FIN bit set? Doesn't seem to be a high priority.

Next meeting: 10 September @ 1400 UTC