Messages in this thread |  | | From | Mikael Pettersson <> | Date | Fri, 21 Feb 2003 15:47:17 +0100 | Subject | Re: UP local APIC is deadly on SMP Athlon |
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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...
Chipset? 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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