From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: 10GBE performance drop with net.ipv4.tcp_timestamps=0
Date: Wed, 20 Jun 2012 11:47:25 +0200
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To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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On Wed, 2012-06-20 at 11:33 +0200, Stefan Priebe - Profihost AG wrote:

> Sure. In that case i get 4Gbit/s in both variants. I also tried two 
> other different machines same result.
> 

So 3.5 on receiver is the problem, it seems ?

And you checked all the stuff about irq affinities, i presume, since a
lot of things might have changed between 2.6.32 and 3.5 ?

cat /proc/interrupts

what kind of NIC it is ?