Re: Activating APIC on single processor

From: David Huggins-Daines (
Date: Thu Dec 28 2000 - 12:15:45 EST

<> writes:

> I activate APIC interruption with the configuration of linux kernel
> 2.4.0test-11. In the linux kernel configuration under processor type and
> features I activate "APIC and IO-APIC support on uniprocessor", and I
> desactivate "Symmetric multi-processing support". The only way I found to
> check APIC activation is looking into /proc/interrupts, no "IO-APIC" can
> be found there. So I read IO-APIC.txt and I suppose there sould be
> conflicts with IRQ of my PCI cards. So I remove all my PCI cards and still
> have no APIC interrupt.
> Is there another way to check APIC activation?
> Am-I doing to right things to activate IO-APIC?

You might not actually have an IO-APIC or even a local APIC. This is
the case with the Mobile PIII for instance (I puzzled over this myself
for a long time).

To find out for sure, run:

grep 'flags.*apic' /proc/cpuinfo

David Huggins-Daines		-
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