On Thu, 2015-04-09 at 17:36 +0100, Stefano Stabellini wrote: > A very big difference: > > echo 262144 > /proc/sys/net/ipv4/tcp_limit_output_bytes > brings us much closer to the original performance, the slowdown is just > 8%
Cool. > > echo 1048576 > /proc/sys/net/ipv4/tcp_limit_output_bytes > fills the gap entirely, same performance as before "refine TSO > autosizing" Sure, this basically disables TCP Small Queue and select the opposite : Favor single flow throughput and huge latencies (bufferbloat) > > > What would be the next step for here? Should I just document this as an > important performance tweaking step for Xen, or is there something else > we can do? I guess this is a reasonable choice. Note that /proc/sys/net/ipv4/tcp_limit_output_bytes is already documented. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
