Re: [PATCH] NUMA-Q disable irqbalance

Linus Torvalds
2002-08-13T17:19:20Z

On Tue, 13 Aug 2002, Martin J. Bligh wrote:
>
> Was there some reason you really need this on P4s? I seem to recall something
> to do with timer interrupts, but don't remember exactly.

Without the explicit balancing, _every_single_ external interrupt comes in
on CPU0 on a P4.

The P4 local APIC doesn't do irq scheduling in hardware (never mind that
Intel documented it as architecture behaviour in earlier local APICs)

Linus