Messages in this thread | | | Date | Fri, 4 Sep 1998 01:24:23 -0400 (EDT) | From | Gregory Maxwell <> | Subject | Re: 2us Interrupt latency's for Linux 2.0.xx |
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On Thu, 3 Sep 1998, George wrote:
> 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
If NT uses the IO-APIC then why is it limited to the 16 normal INTs? Furthermore, if they use IO-APIC how could they screw up their int handling so badily their their int latency is so high dispite the ultra fast IO-APIC.
Perhaps NT 4.0 uses IO-APIC in that it detects it's presence.
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