Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig

Andi Kleen
2006-08-07T15:33:20Z

On Monday 07 August 2006 17:26, Eric W. Biederman wrote:
>
> Currrently on a SMP system we can theoretically support
> NR_CPUS*224 irqs. Unfortunately our data structures
> don't cope will with that many irqs, nor does hardware
> typically provide that many irq sources.
>
> With the number of cores starting to follow Moores
> law, and the apicid limits being raised beyond an 8bit
> number trying to track our current maximum with our
> current data structures would be fatal and wasteful.
>
> So this patch decouples the number of irqs we support
> from the number of cpus. We can revisit this decision
> once someone reworks the current data structures.

Ok. I was about to apply it, but it seems to require
mm patches right now, so i didn't

-Andi