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

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Message-ID: <20090119030844.GA31941@gondor.apana.org.au>
Date:	Mon, 19 Jan 2009 14:08:44 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Willy Tarreau <w@....eu>
Cc:	David Miller <davem@...emloft.net>, 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 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.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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