09February2023 [FreeBSD WIKI]

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====== Attendees ======
  * glebius@
  * olivier@
  * rrs@
  * rscheff@
  * thj@
  * tuexen@
  * Cheng C

====== Ongoing Short Term Projects ======
  * It was discussed whether the ''%%TCP_LOG%%'' socket option should be inherited from the listener. jtl@ said that this should be the case, but interaction with the ''%%sysctl%%''-variable ''%%net.inet.tcp.bb.log_auto_ratio%%'' should be taken into account. The patch is under review: [[https://reviews.freebsd.org/D38436|D38436]].
  * ''%%netstat%%'' does not support reading connection information from a core file anymore. tuexen@ will document that in the man-page.
  * glebius@ asks whether it makes sense to improve the TCP timer precision. tuexen@ states that this is very useful for testing purposes. glebius@ will provide a patch to tuexen@ for testing and tuexen@ will provide feedback, if such a patch us useful for %%FreeBSD%% in general. This applies to the default stack only, not the the RACK or BBR stack, which uses HPTS for timers.
  * At least for testing purposes (packetdrill) it would be good to have LRO support for tun interfaces. tuexen@ suggested to generalize LRO to not depend on an Ethernet header being present. gallatin@ prefers to not make the LRO code more complex, since it most likely will impact the performance. tjh@ has [[https://reviews.freebsd.org/D37437|D37437]] under review, which allows the tun interface to add an Ethernet header. tuexen@ will test this to see if it can also be used to enable LRO for the tun interface. This seems netmap specific. tuexen@ will consider to use tap interfaces in packetdrill.
  * [[https://reviews.freebsd.org/D28822|D28822]] improves PRR. rscheff@ will do some testing, rrs@ and tuexen@ will review.
  * While working on allowing BBLog being used as a replacement of ''%%trpt%%'', tuexen@ figured out that ''%%trpt%%'' is broken in several ways in stable/13. After a short discussion is was decided that it is better to document this brokenness than to fix it by direct commits in the stable/13 branch. tuexen@ will add a note to the ''%%trpt%%'' man-page.

====== Ongoing Longer Term Projects ======
  * rscheff@ is improving %%AccECN%% code: [[https://reviews.freebsd.org/D36303|D36303]].
  * [[https://reviews.freebsd.org/D23230|D23230]] is implementing ECN++.
  * tuexen@ wants to write a tool which dumps the BBLog information of a TCP endpoint from a life system or a core. Using ''%%kvm_read()%%'' has drawbacks as glebius@ pointed out, using a python kgdb script may be an alternative. An alternative is to write a python kgdb script which pumps data into ''%%tcplog_dumper%%''. This would allow to minimize code duplication. @glebius will try to work on this soon.
  * glebius@ and markj@ are improving the inp code and as part of this work will make the transport protocols inp code agnostic.
  * thj@ describes a problem related to SYN-ACK retransmissions occurring in a setup using jails and epairs. There seem to be a 1 second pause.

====== Next Meeting ======
23 February 2023 @ 1500 UTC