Messages in this thread | | | Date | Thu, 24 Jun 2010 18:23:59 -0600 | From | Robert Hancock <> | Subject | Re: 2.6.32.1 kernel unable to use more than 2 of 16 CPUs on Intel E5540 (i7) |
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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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