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

H. Peter Anvin
2006-08-07T17:00:58Z

Eric W. Biederman wrote:
>
> a) Because I would like to flush out bugs.
> b) Because I want a default that works for everyone.
> c) Because with MSI we have a potential for large irq counts on most systems.
> d) Because anyone who disagrees with me can send a patch and fix
> the default.
> e) Because with the default number of cpus we can very close to needing
> this many irqs in the worst case.
> f) This is much better than previous to my patch and setting NR_CPUS=255
> and getting 8K IRQS.
> g) Because I probably should have been more inventive than copying the
> NR_IRQS text, but when I did the wording sounded ok to me.
>

Why not simply reserve 224*NR_CPUS IRQs? If you have 256 CPUs allocating
64K IRQs should hardly matter :)

-hpa