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SubjectRe: SMP speed on 6x86 UP

On Wed, 18 Mar 1998, Pavel Machek wrote:

> > generally, the APIC(s) is rarely touched except at initialization
> > time. So
>
> Well, one bad shot into configuration register at init time is
> probably just enough.

SMP init goes this way:

- we do nonintrusive BIOS signature search to find the 'mp
configuration table'

- we carefully probe the local APICs and fire up all CPUs

- _then_ we go and configure the IO-APIC.

Cyrix based boards should already bail at in the first step, i pretty much
doubt they can ever make it to step 3.

so it must be something else, not the IO-APIC. It could be scheduling
irregularity (APM and Cyrix?)?

-- mingo


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