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 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 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@ will review.
• PR241958: Not sure what happens there. tuexen will try to reproduce it on stable/12 in VBox. thj@ has reproduced this on bhyve.
• D18624: Approved by kbowling@.
• Can the TCP_STATS framework be turned on and sample no connections? Yes. thj@ will do.
• D18892: Upcoming: PRR
• D18985: Upcoming: Rescue retransmission
• D21117: Upcoming: Reduce counter space
• D22438: Upcoming: Performance improvement for after idle
• D25746: Cubic fix. Waiting for NetAPP testing.
• D25976: Another Cubic fix. Waiting for NetAPP testing.
• Cubic: When to increase the congestion window? Once per tick instead of once per send window or when an ACK comes in? Once per ACK is suggested. rscheff@ will provide a patch?
• D6611, D6612, D6656: Get gallatin@ involved. What needs to be done to also support IPv6?
• D8253: rscheff@ will look into it.
• D10894: possibly use hystart++ instead. rrs@ will look into this later this year.
• Anyone using NICs with P4 support?

Next meeting: 27 August @ 1400 UTC