netdev - Re: TCP fast retransmit

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Message-ID: <1323786660.2744.1.camel@edumazet-laptop>
Date:	Tue, 13 Dec 2011 15:31:00 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Esztermann, Ansgar" <Ansgar.Esztermann@...-bpc.mpg.de>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: TCP fast retransmit

Le mardi 13 décembre 2011 à 15:05 +0100, Esztermann, Ansgar a écrit :
> On Dec 9, 2011, at 17:31 , Eric Dumazet wrote:
> 
> >>> It seems you have a lot of packet reorders.
> >>> 
> >>> Are you using multipath or some channel bonding ?
> >> 
> >> Not that I am aware of (i.e. not on our end). However, the connection
> >> will probably routed through a firewall. I will have to check if it is
> >> configured to avoid reordering.
> >> 
> > 
> > Is it a linux based firewall ?
> 
> No, it's Cisco.
> 

OK

You could increase /proc/sys/net/ipv4/tcp_reordering from 3 to 16

(Not sure it will change anything, since its kinda dynamic for a tcp
session)



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