Date: Mon, 16 Jun 2008 11:09:34 -0700
From: Matheos Worku <Matheos.Worku@Sun.COM>
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
In-reply-to: <20080530.000009.02995266.davem@davemloft.net>
To: David Miller <davem@davemloft.net>
Cc: jesper@krogh.cc, yhlu.kernel@gmail.com, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
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David Miller wrote:

>From: Matheos Worku <Matheos.Worku@Sun.COM>
>Date: Thu, 29 May 2008 17:14:29 -0700
>
>  
>
>>Actually what I am suggesting was a workaround for the lack of "TX Ring 
>>Empty" interrupt by not relying on the TX interrupt at all.
>>    
>>
>
>Ahh I see.
>
>Some of the things I talked about in my presentation here in
>Berlin at LinuxTAG yesterday can help mitigate the effects.
>Most of it revolves around batching, and allowing the driver
>to manage the backlog of packets directly when the TX queue
>fills up.
>
>In such a case we could batch the TX queue refill, know how many more
>TX packets we will queue up to the chip right now, and therefore know
>that we can safely set periodic MARK bits and only need to force set
>the MARK bit at the very end.
>
>  
>
>>As for the TX hang, I will try to reproduce the problem and look at
>>the registers for the clue.
>>    
>>
Have been trying but not able to reproduce the timeout. I am using NFS 
V3 with TCP. Are you using UDP by any chance?

Regards
Matheos

>
>Thanks a lot.
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