Messages in this thread | | | Date | Thu, 19 Mar 1998 22:02:49 +0100 (CET) | From | MOLNAR Ingo <> | Subject | Re: SMP speed on 6x86 UP |
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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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