Message-Id: <200303111635.h2BGZN4N007462@picard2.cs.ohiou.edu> From: "Shawn Ostermann" <ostermann@cs.ohiou.edu> Subject: Re: tcptrace Slow Start Duration Date: Tue, 11 Mar 2003 11:35:23 -0500
> given a certain tcp transfer, is it possible with tcptrace to
> calculate the slow start duration?
>
> Thanks,
> Gianluca
It's generally pretty easy to deduce by looking at the time sequence
graph (-S). Printing the value out numerically would require a
heuristic. I imagine that you could watch the outstanding data (sent
but not ACKed; a good estimator of congestion window) and look for it to
"flatten out". Alternately, you could try to match outgoing segments
with incoming ACKs and watch for a 1-to-1 correspondence to start, but
that's an even less robust heuristic.
I guess my answer would be that one could put in a heuristic to
calculate it, but the heuristic would be sufficiently error-prone that
it would be deceiving in many cases.
Any other thoughts??
Shawn
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