Messages in this thread | | | Date | Tue, 28 Sep 1999 08:29:26 -0400 (EDT) | From | "Richard B. Johnson" <> | Subject | Re: Clock Watching the Scheduler 2.2.10unip |
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On Tue, 28 Sep 1999, John Alvord wrote:
> 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. >
Maybe 1 - 2 thousand times per second if your ethernet card is plugged into a network.
Cheers, Dick Johnson **** FILE SYSTEM WAS MODIFIED **** Penguin : Linux version 2.3.13 on an i686 machine (400.59 BogoMips). Warning : It's hard to remain at the trailing edge of technology.
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