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From: David Miller <davem@davemloft.net>
Subject: Re: NIU - Sun Neptune 10g - Transmit timed out reset (2.6.24)
Date: Fri, 09 May 2008 15:45:38 -0700 (PDT)
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From: Matheos Worku <Matheos.Worku@Sun.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.