linux-kernel - Re: 2.6.32.1 kernel unable to use more than 2 of 16 CPUs on Intel E5540 (i7)

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Date:	Thu, 24 Jun 2010 18:23:59 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Roland Dreier <rdreier@...co.com>
CC:	Kurt Newman <knewman@...baldataguard.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.32.1 kernel unable to use more than 2 of 16 CPUs on Intel
 E5540 (i7)

On 06/24/2010 04:05 PM, Roland Dreier wrote:
> Your config seems to have CONFIG_PM and therefore CONFIG_ACPI disabled.
> So the kernel is relying on mptable information.  Unsurprisingly on a
> modern system, that info is probably broken -- since everything would
> have been tested with ACPI.
>
> Try turning on CONFIG_ACPI and see if that helps at all.

Indeed, not having ACPI enabled will prevent any multi-core CPU 
detection. ACPI really has to be enabled for any modern x86 system to 
work properly.

I'd think that the CONFIG_ACPI really should be defaulted on more 
strongly - maybe force it on if CONFIG_EMBEDDED isn't set or something..
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