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SubjectRe: 2us Interrupt latency's for Linux 2.0.xx
On Wed, 2 Sep 1998, Perry Harrington wrote:

>I'm wondering, can the APIC be enabled for UP boards? If so, why
>doesn't Linux enable the APIC as the default interrupt controller
>for single processor Pentium+ systems?

Single processor boards don't have an APIC or IO-APIC. If you read
Documentation/SMP.txt, the note:

o Separate IO-APIC from SMP.

means it's on the agenda to allow the IO-APIC to be used by uniprocessor
kernels running on SMP boards. (which, incidently, NT 4.0 can do.)

-George


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