netdev - Re: 10GBE performance drop with net.ipv4.tcp

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Date:	Wed, 20 Jun 2012 11:28:48 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0

On Wed, 2012-06-20 at 11:25 +0200, Stefan Priebe - Profihost AG wrote:
> Am 20.06.2012 11:17, schrieb Eric Dumazet:
> > On Wed, 2012-06-20 at 11:12 +0200, Stefan Priebe - Profihost AG wrote:
> >> Am 20.06.2012 11:06, schrieb Stefan Priebe - Profihost AG:
> >>>> You seem to have a switch or something that drops packets in this case.
> >>>> You could try to rate limit to 9Gb/s and see if it is better.
> >>> Sadly i can't rate limit to 9Gbit/s on the switch.
> 
> > If you exchange sender/receiver role between linux kernel versions, is
> > it the same problem ?
> I'm testing in both directions. So both are sending and receiving.
> 
> I've now made tests with only one sending an the other receiving.
> 
> When server B is the sender i get 4Gbit/s. When server A is the sender i 
> get full 9,9Gbit/s.
> 
> Stefan

To rule out bad hardware, could you try a 3.5-rc3 kernel on B ?


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