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

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Message-ID: <20090119064520.GD12946@1wt.eu>
Date:	Mon, 19 Jan 2009 07:45:20 +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 10:19:08PM -0800, David Miller wrote:
> From: Willy Tarreau <w@....eu>
> Date: Mon, 19 Jan 2009 07:14:20 +0100
> 
> > On Sun, Jan 18, 2009 at 07:27:19PM -0800, David Miller wrote:
> > > From: Herbert Xu <herbert@...dor.apana.org.au>
> > > Date: Mon, 19 Jan 2009 14:08:44 +1100
> > > 
> > > > One thing to note is that Myricom's driver probably uses page
> > > > frags which means that you're not actually triggering the copy.
> > 
> > So does this mean that the corruption problem should still there for
> > such a driver ? I'm asking before testing, because at these speeds,
> > validity tests are not that easy ;-)
> 
> It ought not to, but it seems that is the case where you
> saw the original corruptions, so hmmm...
> 
> Actually, I see, the myri10ge driver does put up to
> 64 bytes of the initial packet into the linear area.
> If the IPV4 + TCP headers are less than this, you will
> hit the corruption case even with the myri10ge driver.
> 
> So everything checks out.

OK, so I will modify my tools in order to perform a few checks.

Thanks!
Willy

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