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SubjectRe: More than 8 CPUs detected and CONFIG_X86_PC cannot handle it on 2.6.16-rc6
Krzysztof Oledzki <olel@ans.pl> wrote:
>
> On Sat, 11 Mar 2006, Andrew Morton wrote:
>
> > Krzysztof Oledzki <olel@ans.pl> wrote:
> >>
> >> After upgrading to 2.6.16-rc6 I noticed this strange message:
> >>
> >> More than 8 CPUs detected and CONFIG_X86_PC cannot handle it.
> >> Use CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.
> >>
> >> This is a Dell PowerEdge SC1425 with two P4 Xeons with HT enabled (so with
> >> totoal of 4 logical CPUs).
> >
> > Please send full dmesg output for the failing kernel, thanks.
> Attached.
>
> > Which is the most-recently-tested kernel which behaved correctly?
> 2.6.15.6

OK, thanks. I assume the machine's working OK?

From my reading, you have CONFIG_HOTPLUG_CPU enabled and the machine has an
APIC. I'd expect that lots of people would hit that warning but for some
reason they don't - possibly because most APICs don't have sufficiently
high version numbers?

Anyway, various people cc'ed. I _think_ it's harmless, although the way in
which def_to_bigsmp propagates into the DMI and APIC code might be a
problem, depending upon config options.

Certainly the warning is incorrect, but I'm not sure what is the best thing
to do about it?

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