netdev - Re: TCP fast retransmit

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Message-ID: <1323901909.2631.17.camel@edumazet-laptop>
Date:	Wed, 14 Dec 2011 23:31:49 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	"Esztermann, Ansgar" <Ansgar.Esztermann@...-bpc.mpg.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TCP fast retransmit

Le mercredi 14 décembre 2011 à 11:00 -0800, Yuchung Cheng a écrit :
> >
> I use tcptrace to check the time sequence and I am puzzled:
> I see a lot of OOO packets too but how can this happen at a sender-side trace?
> unless the trace is taken close to but not exactly at the sender.
> I expect on seeing in-sequence packets but a lots of SACKs plus some
> spurious retransmists.

I understood the trace was a receiver-side one (a linux machine if I am
not mistaken, while the sender is AIX powered)

(Looking at timings of ACKS, coming a few us after corresponding data
packet arrival)



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