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

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Message-Id: <20090118.192815.41774176.davem@davemloft.net>
Date:	Sun, 18 Jan 2009 19:28:15 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	w@....eu
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

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.

Thanks again.
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