[Discussion] TCP Congestion Window (cwnd)

[Andrei Vishnevski <andrey@xxxxxxxxxxxx>]

Greetings all,

I'm currently conducting a project related to TCP/IP performance over 
wireless links. One of the main problems I faced was getting a value of 
congestion window (cwnd) of the sender. It could be derived by analysing 
tcpdump output, but I wouldn't have 100% confidence in its correctness.

I've successfully patched the kernel and installed userland tools. What 
I need is to get cwnd size every 0.01 second or even more frequently if 
it's possible, and output this information to the file. This file will 
be used later on for building graphs and establishing correllation 
between tcpdump output and changes in cwnd.

I would like to know whether it's possible to collect cwnd information 
directly from /proc/web100? Or may be there is way of outputing this 
information to a file with the desired frequence with userland tools?

Any suggestions will be appreciated.

Yours Sincerely
Andrei Vishnevski

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