From: Yuchung Cheng <ych...@google.com> Date: Sat, 26 Nov 2016 12:10:10 -0800
> This patch set provides instrumentation on TCP sender limitations. > While developing the BBR congestion control, we noticed that TCP > sending process is often limited by factors unrelated to congestion > control: insufficient sender buffer and/or insufficient receive > window/buffer to saturate the network bandwidth. Unfortunately these > limits are not visible to the users and often the poor performance > is attributed to the congestion control of choice. > > Thie patch aims to help users get the high level understanding of > where sending process is limited by, similar to the TCP_INFO design. > It is not to replace detailed kernel tracing and instrumentation > facilities. > > In addition this patch set provides a new option to the timestamping > work to instrument these limits on application data unit. For exampe, > one can use SO_TIMESTAMPING and this patch set to measure the how > long a particular HTTP response is limited by small receive window. > > Patch set was initially written by Francis Yan then polished > by Yuchung Cheng, with lots of help from Eric Dumazet and Soheil > Hassas Yeganeh. Looks great, series applied, thanks!
