Re: [PATCH] tcp: splice as many packets as possible at once

Willy Tarreau
2009-01-19T06:15:28Z

On Sun, Jan 18, 2009 at 07:28:15PM -0800, David Miller wrote:
> From: Willy Tarreau <w@1wt.eu>
> Date: Mon, 19 Jan 2009 01:42:06 +0100
>
> > Hi guys,
> >
> > On Thu, Jan 15, 2009 at 03:54:34PM -0800, David Miller wrote:
> > > From: Willy Tarreau <w@1wt.eu>
> > > Date: Fri, 16 Jan 2009 00:44:08 +0100
> > >
> > > > And BTW feel free to add my Tested-by if you want in case you merge
> > > > this fix.
> > >
> > > Done, thanks Willy.
> >
> > Just for the record, I've now re-integrated those changes in a test kernel
> > that I booted on my 10gig machines. I have updated my user-space code in
> > haproxy to run a new series of tests. Eventhough there is a memcpy(), the
> > results are EXCELLENT (on a C2D 2.66 GHz using Myricom's Myri10GE NICs) :
> >
> > - 4.8 Gbps at 100% CPU using MTU=1500 without LRO
> > (3.2 Gbps at 100% CPU without splice)
> >
> > - 9.2 Gbps at 50% CPU using MTU=1500 with LRO
> >
> > - 10 Gbps at 20% CPU using MTU=9000 without LRO (7 Gbps at 100% CPU without
> > splice)
> >
> > - 10 Gbps at 15% CPU using MTU=9000 with LRO
>
> Thanks for the numbers.
>
> We can almost certainly do a lot better, so if you have the time and
> can get some oprofile dumps for these various cases that would be
> useful to us.

No problem, of course. It's just a matter of time, but if we can push
the numbers further, let's try.

Regards,
Willy