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To: linux-kernel@vger.kernel.org
From: "Holger Hoffstaette" <holger@wizards.de>
Subject: Re: Reproducible data corruption with sendfile+vsftp - splice regression?
Date: Sun, 02 Dec 2007 17:00:03 +0100
Organization: The Fists of the White Lotus
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References: <pan.2007.11.29.23.42.52.661624@wizards.de> <474FC4D9.3020506@cosmosbay.com> <pan.2007.11.30.09.20.24.737500@wizards.de> <475055EE.9060105@hp.com>
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On Fri, 30 Nov 2007 10:26:54 -0800, Rick Jones wrote:

> Could the corruption be seen in a tcpdump trace prior to transmission (ie
> taken on the sender) or was it only seen after the data passed out the
> NIC?

I did the following:

1) turn on tso on the server's r8169: ethtool --offload eth0 tso on
2) on the server: tcpdump -i eth0 -s 0 -w <file>
3) ftp'ed file to 100mbit client

As expected the file was corrupted, and the various corrupted byte
sequences also show up in the tcpdump file at the corresponding offsets.

I did this with 2.6.22.14, so it does not seem to be a recent regression
in .23/.24.

All files can be found here:
http://hoho.dyndns.org/~holger/dist/r8169-tso/

I will gladly try out any other tweaks but need some guidance as I don't
know what exactly to change - maybe without NAPI for the r8169?

thank you
Holger


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