Re: Major network performance regression in 3.7

Eric Dumazet
2013-01-06T02:22:17Z

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 ?