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    SubjectRe: i8259 and IO-APIC
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    On Mon, 2002-05-27 at 15:35, Terje Eggestad wrote:
    > Do you got any numbers that state that it's processing overhead, and not
    > HW latency that is the bulk of interrupt service time? Just curious,
    > I've been looking and can't find this "perceived fact" backed up by
    > facts anywhere.

    It depends what the interrupt actually does. What I was saying is that
    the processing overhead is what hurts not the latency. If you think
    about a continual stream of events latency on the busses effectively
    skews the delivery time of the interrupt but not the rate of processing.

    > BTW: according to "IA-32 Intel Arch. Software Developer's Man Vol 3"
    > both P3 and P4 the APIC bus is three wire, two data and one clock.


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