netdev - RE: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

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Date:	Mon, 25 Jan 2010 13:41:19 +0800
From:	Jie Yang <Jie.Yang@...eros.com>
To:	Anders Boström <anders@...insight.net>
CC:	"ben@...adent.org.uk" <ben@...adent.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"565404@...s.debian.org" <565404@...s.debian.org>,
	Xiong Huang <Xiong.Huang@...eros.com>
Subject: RE: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

Anders Boström <anders@...insight.net> wrote:

> Cc: ben@...adent.org.uk; netdev@...r.kernel.org;
> 565404@...s.debian.org; Xiong Huang
> Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e:
> TSO is broken

> One strange observation is that I can only reproduce this
> problem when transmitting data from a NFS-server using TCP
> with Atheros AR8121/AR8113/AR8114.
>
> I've tried to reproduce the problem using test-programs, like
> nttcp and netpipe, without any success. One observation is
> that the test-programs *only* generates 1500 bytes
> IP-packets. When the NFS-server sends data, a sequence of
> 1500 bytes IP-packets are generated, ending with a shorter
> packet. And this last packet in the sequence has 1500 in the
> IP-header length field, but is shorter.
>
following is my test cese,

a nfs server server with ar8131chip, device id 1063. export /tmp/ dir as the nfs share directory,
the client, mount the server_ip:/tmp to local dir /mnt/nfs, ust a python script to write and read data on the
/mnt/nfs/testnfs.log. it works fine.

Can you give me some advice on how to reproduce this bug??

Best wishes
jie
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