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    SubjectRe: 2us Interrupt latency's for Linux 2.0.xx

    APIC is hardware disabled on older boards. Not sure about newer boards.

    On Wed, Sep 02, 1998 at 04:18:53PM -0700, 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?
    >
    > --Perry
    >
    > > >
    > > > > _external_ interrupts have much higher latencies. (especially as old
    > > > > XT-PIC interrupts halt the CPU for a considerable amount of time ... this
    > > > > is not the case with IO-APIC and inter-CPU interrupts.)
    > > > >
    > > > > -- mingo
    > > > >
    >
    > --
    > Perry Harrington Linux rules all OSes. APSoft ()
    > email: perry@apsoft.com Think Blue. /\

    --

    ---------------------------------
    Victor Yodaiken
    Department of Computer Science
    New Mexico Institute of Mining and Technology
    Socorro NM 87801
    Homepage http://www.cs.nmt.edu/~yodaiken
    PowerPC Linux page http://linuxppc.cs.nmt.edu
    Real-Time Page http://rtlinux.org


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