netdev - Re: Re: Re: limited network bandwidth with 3.2.x kernels

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Message-ID: <1329198902.24837.11.camel@edumazet-laptop>
Date:	Tue, 14 Feb 2012 06:55:02 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	alekcejk@...glemail.com
Cc:	netdev@...r.kernel.org
Subject: Re: Re: Re: limited network bandwidth with 3.2.x kernels

Le mardi 14 février 2012 à 01:49 +0200, alekcejk@...glemail.com a
écrit :
> В сообщении от Понедельник 13 февраля 2012 23:44:16 вы написали:
> > Le lundi 13 février 2012 à 21:18 +0100, Eric Dumazet a écrit :
> > I wonder if the other side of your link believes link is in half duplex
> > mode... Could you please check ?
> 
> I have no access to other side, the only I can check is ethtool and mii-diag (kernel-3.2.3):

I have seen numerous duplex mismatches in some data centers after a
reboot. One side believes link is full duplex, the other side believes
its half duplex.

You could setup a pktgen/hping3 to send 2.000 small frames per second to
your gateway and check if you still can download at normal speeds.

hping3 --udp -s 9 -p 9 -i u500 192.168.1.1


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