Rick Jones wrote:

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To which cpu(s) were the neptune's interrupts assigned? (grep <ethN> 
/proc/interrupts)

Several

Which ones?-)  I suspect that since it is several that at least answers 
the MSI_X question right?  Or is it possible to have a single device 
have several MSI interrupts?

The table is rather large.
http://rafb.net/p/a9zfFA59.html

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Have you tried any tests without any filesystem involvement? 

no not yet. I'll try that.

If you decide to go the netperf route, feel free to contact me directly 
with netperf questions, or via the netperf-talk mailling list on 
netperf.org.

Ok.

-- 
Jesper