linux-kernel - Re: TCP fast retransmit

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Message-ID: <1D4F412F-2623-47E6-AF5E-E7207DEE162C@mpi-bpc.mpg.de>
Date:	Fri, 25 Nov 2011 13:55:41 +0100
From:	"Esztermann, Ansgar" <Ansgar.Esztermann@...-bpc.mpg.de>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: TCP fast retransmit

On Nov 25, 2011, at 11:42 , Eric Dumazet wrote:

> 
> Could you provide a trace showing what you believe is a violation of the
> standards ?

"Violation" is probably a bit on the harsh side (after all, it says "should"), but here goes (wireshark/libpcap format):
The trace has been collected on 10.208.9.87. After one ACK plus five duplicates, a retransmission is triggered -- but it takes more than 200 ms, so that would be an ordinary retransmission. The original trace is (much) longer, but I've cut it down to keep the mail small. If required, I can provide more.

Thanks,

A.

-- 
Ansgar Esztermann
DV-Systemadministration
Max-Planck-Institut für biophysikalische Chemie, Abteilung 105

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