Nehalem network performance

[Kelvin Ku]

On Mon, Feb 01, 2010 at 07:35:11AM +0200, Gilboa Davara wrote:
> > > 
> > > Can you post the output of $ mpstat -P 1 ALL during peak load?
> > > 
> > 
> > We run "mpstat -P 5 ALL" continuously; is this sufficient resolution? I've
> > attached the mpstat output from the 09:30-10:30 yesterday, which is one of the
> > busiest hours of the day for multicast traffic.
> 
> ~15'000 interrupts/core seems rather high to me - especially considering
> the fact that this is a 1GbE link.
> Reducing the InterruptThrottleRate to 1000/5000 while increasing the
> queue count (ethtool -G ... rx ...) should decrease it.

Oops, forgot to respond to this. The interrupt rate is currently around 4500
intr/s in total (i.e. the sum of intr/s over all cores) under load, which seems
normal.

Also, I've attached the dmidecode and lspci output.

- Kelvin
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