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

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Message-ID: <4824C936.9000103@krogh.cc>
Date:	Fri, 09 May 2008 23:59:18 +0200
From:	Jesper Krogh <jesper@...gh.cc>
To:	David Miller <davem@...emloft.net>
CC:	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)

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.

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?

-- 
Jesper
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