Attendees
- glebius@
- olivier@
- rscheff@
- rrs@
- tuexen@
- cc@
Ongoing Short Term Projects
- It was discussed whether the
TCP_LOGsocket option should be inherited from the listener. jtl@ said that this should be the case, but interaction with thesysctl-variablenet.inet.tcp.bb.log_auto_ratioshould be taken into account. The patch is under review: D38436. netstatdoes 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. Setting the
sysctlvariablekern.timecounter.alloweddeviationto zero allows the timers to run of very precisely, which is useful when runningpacketdrill. However, it affects the overall system performance. - 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 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.
- 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 thattrptis broken in several ways in stable/13. tuexen@ will commit a fix by direct commits in the stable/13 branch and will add a note to thetrptman-page thattrptis deprecated and will be removed in FreeBSD 14. - tuexen@ will try to improve the error handling in PRU functions to allow the reporting of more error cases and put it up for review. glebius@ will review it and make sure it works with the recent changes in the inp/tcb area.
- Make
sysctl-variablenet.inet.tcp.functions_defaultper vnet or fib? tuexen@ will implement the vnet support after rrs@ gets updates for stack swiching in.
Ongoing Longer Term Projects
- rscheff@ is improving AccECN code: D36303. rrs@ will review it and implement it for the rack stack.
- D23230 is implementing ECN++. rrs@ will review it.
- 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 intotcplog_dumper. This would allow to minimize code duplication. @glebius will try to work on this soon.
Next Meeting
20 April 2023 @ 1500 UTC