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

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Message-ID: <20090107125356.GB26235@gondor.apana.org.au>
Date:	Wed, 7 Jan 2009 23:53:56 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Willy Tarreau <w@....eu>
Cc:	Evgeniy Polyakov <zbr@...emap.net>,
	Jens Axboe <jens.axboe@...cle.com>,
	Jarek Poplawski <jarkao2@...il.com>,
	Changli Gao <xiaosuo@...il.com>, 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 01:52:01PM +0100, Willy Tarreau wrote:
> 
> Evgeniy, I'd like to understand something related to our apparent lack of
> knowledge of when the data is effectively transmitted. If we're focusing
> on the send part, I can't understand why I never reproduce the corruption
> when the data source is a file or loopback, but I only see it when the source
> is an ethernet interface. How is it possible that a problem affecting only

It doesn't happen with a file because in that case you don't
start with an skb so there is no skb->head.  It probably doesn't
happen with loopback because loopback does GSO so again skb->head
does not exist (so to speak).

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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