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

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Date:	Fri, 09 May 2008 15:09:37 -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: Fri, 09 May 2008 20:32:53 +0200
>>
>>> When it works I doesnt seem to be able to get it pass 500MB/s.
>>
>> With this card you really need multiple cpus and multiple threads
>> sending data through the card in order to fill the 10Gb pipe.
>>
>> Single connections will not fill the pipe.
> 
> The server is a Sun X4600 with 8 x dual-core CPU's, setup with 64
> NFS-threads. The other end of the fiber goes into a switch with gigabit
> ports connected to 48 dual-core cpus. The test was done doing a dd on a
> 4.5GB file from the server to /dev/null on the clients.

Are you doing a TX or RX (with respect to the 10G if)?
-- matheos

> 
> The number of contextswitches seems enourmous.. over 120.000 sometimes.
> When transmitting around the same amount of data (4xgigabit bonded with
> 802.3ad) 4x110MB/s the amount of contextswitches only reaches 3-4.000. I
> have no idea if this has any relevance.
> 
> Should this setup not be able to fill the pipe?
> 

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