On Wed, Sep 11, 2013 at 5:49 AM, Josh Boyer wrote: > On Sun, Jul 21, 2013 at 9:36 PM, Michael Sterrett wrote: >> Since upgraded to 3.10.1 which exhibits the same issue (probably not >> surprising). >> >> sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=3 seems to take >> care of it. > > We're still getting reports of this with 3.10.10 in Fedora [1]. At > least one of the reporters has said those sysctl settings didn't help. > > Is there anything else that can be gathered to help track this down? since frto=0 didn't help, I suspect it's either a bug introduced in the tail loss probe patch 9b717a8d (tcp: TLP loss detection) or other changes related loss recovery. could you try disable TLP by sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=1 if it still does not work. disable any form of early retransmit by sysctl net.ipv4.tcp_frto=0 net.ipv4.tcp_early_retrans=0 if you can test a custom build kernel, please try this debugging patch. > > josh > > [1] https://bugzilla.redhat.com/show_bug.cgi?id=989251