netdev - Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

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Date:	Tue, 27 May 2008 18:18:57 -0700
From:	Matheos Worku <Matheos.Worku@....COM>
To:	Jesper Krogh <jesper@...gh.cc>
Cc:	David Miller <davem@...emloft.net>, yhlu.kernel@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)

Jesper Krogh wrote:

> David Miller wrote:
>
>> From: Jesper Krogh <jesper@...gh.cc>
>> Date: Mon, 26 May 2008 22:54:53 +0200
>>
>>> Applied and running.. I've now pushed 400GB of data through it 
>>> trying to
>>> get it to hit the bug but it is still running.
>>>
>>> So without saying that it solved the problem, it definately seems so.
>>> 2.6.26-rc4 + above patch.
>>
>>
>> Thanks for testing.
>
>
> Ok. I was too early out.. it ended up in the same situation again.
>
> May 27 08:09:12 hest kernel: [42953871.982072] NETDEV WATCHDOG: eth4: 
> transmit timed out
> May 27 08:09:17 hest kernel: [42953877.827797] NETDEV WATCHDOG: eth4: 
> transmit timed out
> May 27 08:09:22 hest kernel: [42953883.958375] NETDEV WATCHDOG: eth4: 
> transmit timed out
> May 27 08:09:27 hest kernel: [42953890.668401] NETDEV WATCHDOG: eth4: 
> transmit timed out
>
>
> Jesper

Dave,
Considering that fixing the HW would take considerable time, I was 
wondering if the scheme we use in the nxge driver could be considered as 
a workaround. Since the niu driver is already doing skb_orphan as a work 
around, what if  already transmitted TX buffers are  reclaimed 
periodically, within dev->hard_start_xmit() ?  Then TX_DESC_MARK would 
be set if/when available TX descriptor count falls below some watermark. 
Disable device TX queue about the time  TX_DESC_MARK is set and enable 
it within TX interrupt.

Regards
Matheos


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