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    SubjectRe: Clock Watching the Scheduler 2.2.10unip
    Date
    On Mon, 27 Sep 1999 22:11:38 -0400 (EDT), "Richard B. Johnson"
    <root@chaos.analogic.com> wrote:

    >On Mon, 27 Sep 1999, Robert Redelmeier wrote:
    >
    >> While trying to determine kernel overhead, I wrote a small pgm
    >> (below) using `rdtsc` to figure out kernel interrupts. I get
    >> some strange results:
    >>
    >> 1) 500 interrupts take 5 seconds. No surprise there. Except
    >> on SMP (& FreeBSD2.2.8) systems, where they only take
    >> ~2.7 seconds. Are these spurrious interrupts? Or SMP?

    500/5 = 100 = default HZ... so maybe you were interrupted 100 times a
    second.

    john alvord


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