[KLUG Members] SMP and ACPI in 2.6.12
Kevin Mitchell
kevin at godzilla.iserv.net
Tue Jun 28 15:55:03 EDT 2005
SMP or hyper-threading? Good question. At first I thought SMP, but after
further examination of the logs it appears to break hyper-threading. I'm
guessing this is the case because dmesg gives me 2 different physical
processor IDs in the old kernel.
The old kernel was not compiled with ACPI at all.
Kevin
On Tue, 28 Jun 2005, Bruce Smith wrote:
> Did it break SMP or hyper-threading?
>
> Was the old kernel compiled with ACPI as modules, if loaded in the
> initrd would fix the problem?
>
> - BS
>
>
>> I recently upgraded some dual Xeon machines from the 2.6.3 kernel to
>> 2.6.12 and it appeared to break SMP. When I would cat /proc/cpuinfo or
>> ran top I would only see 2 processors rather than the previous 4
>> processors. After some head scratching and google searches I tried
>> enabling ACPI support for Processor and Thermal Zone and recompiled and
>> I had my 4 processors again. It appears that there has been some change
>> in the kernel between 2.6.3 and 2.6.12 that makes this necessary. Does
>> anyone know if this is intentional? Has anyone else ran into such a
>> thing?
>
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