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SubjectRe: 2.6.13-rc4: no hyperthreading and idr_remove() stack traces
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Andrew Morton <akpm@osdl.org> writes:

> Frank van Maarseveen <frankvm@frankvm.com> wrote:
>>
>> 2.6.13-rc4 does not recognize the second CPU of a 3GHz HT P4:
>
> OK, we seem to have broken your APIC code.

There is a big difference here in that one kernel is using
the ACPI MADT tables and the other kernel is using the MP table.

I suspect the MP table on your system is incomplete while
your ACPI MADT does specify both logical cpus.

Eric
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