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

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Message-ID: <20090119061120.GA12946@1wt.eu>
Date:	Mon, 19 Jan 2009 07:11:21 +0100
From:	Willy Tarreau <w@....eu>
To:	David Miller <davem@...emloft.net>
Cc:	herbert@...dor.apana.org.au, jarkao2@...il.com, zbr@...emap.net,
	dada1@...mosbay.com, ben@...s.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

On Sun, Jan 18, 2009 at 07:28:15PM -0800, David Miller wrote:
> From: Willy Tarreau <w@....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@....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

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