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

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Message-Id: <20080509.150756.157662019.davem@davemloft.net>
Date:	Fri, 09 May 2008 15:07:56 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jesper@...gh.cc
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)

From: Jesper Krogh <jesper@...gh.cc>
Date: Fri, 09 May 2008 23:59:18 +0200

> 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.

A single file transfer will not fill the pipe using this card, no
matter how many cpus you have :-)

The card is designed such that multiple parallel data streams over
different connections result in the greatest throughput.

> Should this setup not be able to fill the pipe?

Nope, not with this card.
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