netdev - Re: TCP fast retransmit

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Message-ID: <908E481A-0C6A-4FA6-AE10-DC51DAE9E80A@mpi-bpc.mpg.de>
Date:	Tue, 29 Nov 2011 10:00:04 +0100
From:	"Esztermann, Ansgar" <Ansgar.Esztermann@...-bpc.mpg.de>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TCP fast retransmit


On Nov 25, 2011, at 17:36 , Eric Dumazet wrote:

> Could you send a sample pcap of such problem, but please include full
> tcp sesssion, from the first SYN packet, up to packets following
> restransmits.

I will prepare one (these session often run for hours or days, as they're our backup runs). It may take a few days, as I'm on sick leave because of an accident.

> A diff of "netstat -s" taken before your session and after your session
> on receiver would help too, if receiver is not a loaded machine of
> course.
> 
> Also, what version of linux kernel are you using in receiver ?

2.6.37.6 with openSUSE patches in the sender, some version of AIX in the receiver. The latter seems to be critical: we've never encountered this problem with any other combination of OSs but AIX & Linux.


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


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