Within the Linux 2.1.124 I identified the code, that prevents the
adaption of the congestion control window (CWND) if the received
ack is a ack that belongs to an retransmitted packets.
Thanks for the great detailed analysis (I wish all TCP reports were
like this one). I will look at the specs and the code over the next
few days and figure out what we should be doing, and fix our stuff if
we are wrong.
I will note in passing that I have noticed those behavior in various
traces I had while I did most of my TCP output engine rewrite. I
always kept forgetting to go back and see if it was correct to do slow
start or not during timeout based recovery.
Later,
David S. Miller
davem@dm.cobaltmicro.com
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