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

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Message-ID: <1340186788.4604.857.camel@edumazet-glaptop>
Date:	Wed, 20 Jun 2012 12:06:28 +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 11:50 +0200, Stefan Priebe - Profihost AG wrote:
> Am 20.06.2012 11:47, schrieb Eric Dumazet:
> > 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 ?
> Yes.
> 
> > 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 ?
> 
> It is a single core E5 Xeon - i've set the affinity like this:

And you still have the retransmits in "netstat -s" output ?

Might be a firmware or pci issue, I have same cards but no problem here.

Check LRO is on ?

ethtool -k eth2


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