linux-kernel - Re: Data corruption issue with splice() on 2.6.27.10

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Message-ID: <20090107115605.GA29250@ioremap.net>
Date:	Wed, 7 Jan 2009 14:56:05 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Willy Tarreau <w@....eu>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Data corruption issue with splice() on 2.6.27.10

On Wed, Jan 07, 2009 at 10:50:32PM +1100, Herbert Xu (herbert@...dor.apana.org.au) wrote:
> > That would not happen without scatter-gather support on the interface,
> > date would be plain copied, and after Jarek's requst Willy confirmed
> > that corruption happens with all acceleration being turned off.
> 
> It will happen without scatter-gather support.  The problem
> is with skb->head, which is always there.  In any case, SG can't
> make any difference because the skb is an inbound one and most
> drivers only produce linear packets.

But it will not push pages into the stack, but copy them including copy
of the submitted head?

-- 
	Evgeniy Polyakov
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