netdev - Re: Major network performance regression in 3.7

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Date:	Sat, 05 Jan 2013 18:22:13 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Major network performance regression in 3.7

On Sun, 2013-01-06 at 03:18 +0100, Willy Tarreau wrote:
> On Sat, Jan 05, 2013 at 06:16:31PM -0800, Eric Dumazet wrote:
> > On Sat, 2013-01-05 at 17:51 -0800, Eric Dumazet wrote:
> > > On Sat, 2013-01-05 at 17:40 -0800, Eric Dumazet wrote:
> > > > On Sun, 2013-01-06 at 02:30 +0100, Willy Tarreau wrote:
> > > > 
> > > > > Ah interesting because these were some of the mm patches that I had
> > > > > tried to revert.
> > > > 
> > > > Hmm, or we should fix __skb_splice_bits()
> > > > 
> > > > I'll send a patch.
> > > > 
> > > 
> > > Could you try the following ?
> > 
> > Or more exactly...
> 
> The first one did not change a iota unfortunately. I'm about to
> spot the commit causing the loopback regression. It's a few patches
> before the first one you pointed. It's almost finished and I test
> your patch below immediately after.

I bet you are going to find commit
69b08f62e17439ee3d436faf0b9a7ca6fffb78db
(net: use bigger pages in __netdev_alloc_frag )

Am I wrong ?


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