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

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Message-ID: <20080522171531.GZ28241@solarflare.com>
Date:	Thu, 22 May 2008 18:15:33 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jesper Krogh <jesper@...gh.cc>
Cc:	David Miller <davem@...emloft.net>, Matheos.Worku@....COM,
	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: Matheos Worku <Matheos.Worku@....COM>
> >Date: Fri, 09 May 2008 15:36:17 -0700
> >
> >>I have observed TX throughput degradation (and increased CPU 
> >>utilization)  occurs with increased # of connections, when CPU count > 4 
> >>CPUs.  I don't think it is related to the driver (or HW).
> >
> >All transmits through a device are fully serialized currently,
> >it's a known problem and something we plan to fix.
> 
> I google'd up this one:
> 
> http://vger.kernel.org/~davem/davem_tokyo08.pdf (slide 23+).
> 
> Does this mean that I can expect every 10G card to have this limitation
> under Linux? Or are some known to be better than others?
> (I can probably justify paying for another 10G card if I can expect to
> gain the last 400MB/s).
[...]

Our controller and driver can reach line rate for a single TCP/IPv4 stream,
depending on the host system.  I don't think we're alone in that, though
there are few published benchmarks that don't involve TOEs.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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