Discussion

• kp@ asks about status of TCP test suite
  • decision to move tests to base system so we can align behavior changes with corresponding changes to tests
  • tool (packetdrill) will still live in a port, similar to things like scapy which also live in ports and are also used for tests
• PR 252913: tuexen@ got a tracefile and some information from Netflix; impacts 12, waiting for 13 to be released.
• PR 238741: Fixed and MFCd to 13.
• D23230: ECN++, rscheff@ will investigate the sysctl interface. Still in progress.
• D28813: MFCd.
• D28819: MFCd.
• D28702: Planned for main, mid March. Still in progress, waiting for 13 release.
• D28634: Fix dup acks triggering a fast retransmission when we don't receive SACKs. Clarified the SACK negotiation. Needs reviews.
• PR 253476: ipfw injecting TCP segments without timestamps even if they are required. The result was that this should be fixed in ipfw. Other implementation might also do strict checks. There is a sysctl variable to enforce less strict checks.
  • kp@ checked and pf does not have the same bug
  • we consider this closed from the TCP side
• PR 253848: fixed by D29083
• rscheff@ has something which works with PRR for ECN and congestion window reduction with NewReno. No plans to MFC. Will wait for 13 to commit to main.
• thj@ asks for TCP blackbox log tools.
  • Tools are already available in ports:
    • devel/bbparse
    • net/read_bbrlog
    • net/tcplog_dumper
  • There was a discussion at IETF/IRTF about TCP schema for Qlog
    • Discussion in our meeting about generic fields vs. fields needed for debugging
• Lost retransmission detection: D28931 is an idea for doing SACK loss recovery in the base stack. It is a simpler alternative to TLP and RACK. tuexen wonders if this should be an internet-draft? rscheff suggests it might have low interest at IETF.

Next meeting: 25 March @ 1400 UTC