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

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Message-Id: <20090118.192719.198405397.davem@davemloft.net>
Date:	Sun, 18 Jan 2009 19:27:19 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	w@....eu, 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: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 19 Jan 2009 14:08:44 +1100

> On Mon, Jan 19, 2009 at 01:42:06AM +0100, Willy Tarreau wrote:
> >
> > 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)
> 
> One thing to note is that Myricom's driver probably uses page
> frags which means that you're not actually triggering the copy.

Right.

And this is also the only reason why jumbo MTU worked :-)
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