Re: >10% performance degradation since 2.6.18

[Arjan van de Ven]

On Fri, 3 Jul 2009 21:54:58 +0200
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> > That would seem to be a fruitful avenue of
> > investigation -- whether limiting the cards to a single RX/TX
> > interrupt would be advantageous, or whether spreading the eight
> > interrupts out over the CPUs would be advantageous.
> 
> The kernel should really do the per cpu binding of MSIs by default.

... so that you can't do power management on a per socket basis?
hardly a good idea.

just need to use a new enough irqbalance and it will spread out the
interrupts unless your load is low enough to go into low power mode.



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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