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

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Message-ID: <20090107115032.GA25198@gondor.apana.org.au>
Date:	Wed, 7 Jan 2009 22:50:32 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <zbr@...emap.net>
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 02:29:06PM +0300, Evgeniy Polyakov 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.

Cheers,
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