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

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Date:	Wed, 20 Jun 2012 13:08:34 +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 12:06 +0200, Eric Dumazet wrote:
> 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
> 


Ah, your ethtool -S gives strange fdir_miss counts, you should ask Intel
guys help maybe...



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