Transport Meeting 20 Apr 2017

We discussed https://reviews.freebsd.org/D10272 as a group and decided that this patch should be accepted.

jtl@ opened two reviews for ICMP rate limit code and would like review https://reviews.freebsd.org/D10387 https://reviews.freebsd.org/D10388

jtl@ has new code to make the netstat code more efficient and will put up reviews soon

gnn@ is going to push on the packetdrill folks to start accepting our changes

rrs@ is ready to start putting Rack and BBR code into HEAD. The code depends on jtl@'s black box code.

gnn@ would like to take a look at the black box code before accepting it into the tree. rrs@ to follow up with gnn@ on traces and the new UI they've written.

rrs@ has structured the inpcb/tcpcb to minimize cache hits on the structures for improved performance. gnn@ suggests getting those diffs to bz@. the initial performance improvement numbers are quite promising as they are now serving 97Gbps and maintain 50% free CPU.

gnn@ asks about BBR with other workloads. rrs@ says that they'll be working further to address any sharp edges.

gnn@ will make sure there is a Transport session at BSDCan

hiren@ is experimenting with avoiding pacing with small files on BBR.

glebius@ is continuing his work on improving the performance of listening sockets. The only sub-system where this might be an issue is SCTP but tuexen@ believes that there is no blocking problem. https://reviews.freebsd.org/D9770

hiren@ asks if the Rack code has jtl@'s long fixes. jtl@ will check but does point out that they have not seen any issues in the system at NetFlix.