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

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Message-ID: <20090106100112.GB9513@ff.dom.local>
Date:	Tue, 6 Jan 2009 10:01:13 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Data corruption issue with splice() on 2.6.27.10

On Tue, Jan 06, 2009 at 10:41:38AM +0100, Willy Tarreau wrote:
...
> > Great story! Alas I don't understand this fully either, but it seems
> > Changli Gao was concerned with sendpage sending this "as pages", so
> > when NETIF_F_SG flag is available. Did you try this without SG btw?
> 
> No I did not. I can try, it's not too hard. It would in part defeat the
> purpose of the mechanism (especially at 10 Gbps) but at least it will
> help narrow the problem down.

Yes, I meant it only as a proof of concept. BTW, delaying TCP acks a
bit for these sendpages should then make it more reproducible, I guess.

Jarek P.
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