[KLUG Members] SMP and ACPI in 2.6.12

[Kevin Mitchell]

It appears that this happened with 2.6.12-rc6 and that it was discussed on 
the kernel listserv:

http://seclists.org/lists/linux-kernel/2005/Jun/4080.html

I like how the "answer" is "I would think" followed up with "I was hoping 
someone else would comment."

Oh well, perhaps they'll document this requirement a little bit better in 
the next kernel.

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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