[Ns-bugs] [Bug 579] TCP congestion window is not updated whent segment size chages

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=579





--- Comment #6 from Pavel Boyko <boyko at iitp.ru>  2009-06-30 01:10:07 EDT ---
By the way, I have one more confusing 200 ms delay between the first and the
second packets in TCP session.

This time the reason is delayed ack -- receiver doesn't reply on the first
packet waiting for a) the second one OR b) 200 ms (delayed ack timeout). But
the sender has CWND = (segment size) by default and doesn't send the second
segment waiting for an ack. So both wait for 200 ms in vain.

Setting ns3::TcpSocket::InitialCwnd attribute to "2" solves this problem.
Should we set this as default (sorry, I don't know what TCP spec says about
this)? 


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