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SubjectRe: UP local APIC is deadly on SMP Athlon
Ion Badulescu writes:
> On Thu, 20 Feb 2003, Jeff Garzik wrote:
> > Ion Badulescu wrote:
> > > A UP kernel compiled with CONFIG_X86_LOCAL_APIC=y dies a very horrible
> > > death on an SMP Athlon motherboard (Tyan S2462 and S2468), flooding the
> > > console with the following messages:
> >
> > IMO just assume this option is just broken, unless you absolutely need it.
> My only boxes on which this is a problem are the SMP athlons, and only
> with UP kernels...

Is the second CPU installed or not?
If the second CPU is installed, has it been disabled in BIOS?

Relevant config? What combinations of UP_APIC and UP_IOAPIC have
you been using? Has ACPI been enabled or not?

A plain kernel with UP_APIC but no SMP or UP_IOAPIC shouldn't
provoke the kinds of APIC errors you mentioned, unless the APIC
bus is noisy due to a missing second CPU (just a theory).

> Anyway, I'd like to get to the bottom of this, since I've narrowed it down
> so much. Anyone know who submitted the APIC changes in 2.4.10-pre12?

Ingo Molnar, Maciej W. Rozycki, and myself.

> debug it myself, but I know next to nothing about the APIC. If you know
> where to get some documentation, I'm more than willing to give it a shot.

Intel's IA32 manual set, Volume 3, is required reading.

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