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SubjectRe: [PATCH] x86_64: Restore the proper NR_IRQS define so larger systems work.
Eric W. Biederman wrote:
> Xen pv 64 will work at least as well with a larger definition for
> NR_IRQS as it will work with a smaller definition, and since
> NR_VECTORS is 256 we always have more irqs with the 32bit definition
> we were mistakenly using.
>
> Xen has 1024 event channels so I expect 1024 would the nice number to
> provide there.
>

Yes, but really its overkill. It needs about 6 interrupts/cpu for
normal system overhead (timer, IPI, things like that), and then some
amount for virtual devices.

dom0 - the control domain - will need some number of events per other
guest domain, so it can start feeling the pressure depending on how many
domains and devices there are.

J


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