On Aug 1, 2014, at 2:48 PM, Jordan Justen <jljus...@gmail.com> wrote:
> On Fri, Aug 1, 2014 at 8:12 AM, Scott Duplichan <sc...@notabs.org> wrote:
>> Chen Fan [mailto:chen.fan.f...@cn.fujitsu.com] wrote:
>>
>>
>> With this patch set, the APs are launched even when
>> a project never uses mpservice. To minimize boot time
>> it would be good if no AP launch code runs unless
>> mpservice is actually used.
>
> I think most need need to start the APs regardless. For example,
> nearly all systems should program the MTRRs the same for all APs.
>
You also have to setup SMM on the APs, and the APs have to be in a “well known
state” when the OS is booted. This state is defined in the MP Spec 1.4 (might
have moved to ACPI, since MP spec last update was 1997).
Thanks,
Andrew Fish
> If a system has a way to know that there are no APs, then some time
> could be saved.
>
> -Jordan
>
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