Re: [patch] x86_64: fix cpu_to_node setup for sparse apic_ids

From: Ravikiran G Thirumalai
Date: Wed Jul 27 2005 - 20:51:12 EST

On Wed, Jul 27, 2005 at 06:24:45PM -0700, Andrew Morton wrote:
> Ravikiran G Thirumalai <kiran@xxxxxxxxxxxx> wrote:
> >
> > While booting with SMT disabled in bios, when using acpi srat to setup
> > cpu_to_node[], sparse apic_ids create problems. Here's a fix for that.
> >
> Again, I don't have enough info here to judge the urgency of this patch.
> What are the consequences and risks of not having this patch in 2.6.13, and
> to how many machines?

Without this patch, intel x86_64 boxes with hyperthreading disabled in the
bios (and which rely on srat for numa setup) endup having incorrect
values in cpu_to_node[] arrays, causing sched domains to be built
incorrectly etc.

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