Re: irqbalance mandatory on SMP kernels?

[Arjan van de Ven]

On Wed, 2006-04-19 at 10:38 -0400, Theodore Ts'o wrote:
> On Wed, Apr 19, 2006 at 04:23:14PM +0200, Arjan van de Ven wrote:
> > as long as the irqs are spread the apaches will (on average) follow your
> > irq to the right cpu. Only if you put both irqs on the same cpu you have
> > an issue
> 
> Maybe I'm being stupid but I don't see how the Apache's will follow
> the IRQ's to the right CPU.  I agree this would be a good thing to do,
> but how does the scheduler accomplish this?

iirc this part of the kernel uses wake_up_sync() and such, which tend to
pull the apache to the cpu (if it's idle) in the long term
(or it ought to; at one point it did)

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