> > 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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