Messages in this thread | | | From | (John Alvord) | Subject | Re: Clock Watching the Scheduler 2.2.10unip | Date | Tue, 28 Sep 1999 02:22:21 GMT |
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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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