• TransportProtocols
• 21Apr16

Weekly Hangout 21 April 2016

• Possibly issue with /32 vs. /24 wrt route caching from (net@) - UPDATE (hiren 04/21/2016 13:04 PDT) It turned out to be something broken with lacp/lagg and not route caching.
• UDPv6 might also need the route caching changes as well. UDPv4 seems to be holding the lock longer now as well.
• LLNW is looking at building out a client device lab. A hot issue has to do with under performance with a specific test where streams have .1% packet packet loss. Start with .1% and increment by .1%. Time to first re-buffer is the measurement. They will share results once they have them.
• The patch from jtl@ does not solve all the underflow problems but does solve some of them. Hiren is looking at tcp_send_probe() at the end of tcp_output(). Hiren will continued to dig into this.
• Any thoughts on Hiren's cwnd patch? Has not tried it in production but Randall said that dropping to 1 was better for his test than dropping to 1/2.
• Hiren has a patch that enables the pipe calculation and cwnd via a sysctl. He will put that into Phabricator and then eventually in HEAD. This will make it interact correctly with RFC 6675.
• Kevin will start getting data collection at their edge. He believes that they will have that soon.
• George has started working with a group on a set of protocol conformance tests which ought to be open sourced in the near future and which cover the layers from NICs up to TCP.
• Michael has an updated version of the packetdrill port which he will point us at so that George can update the port.