Messages in this thread | | | Date | Tue, 3 Jun 2003 06:09:12 -0700 | From | William Lee Irwin III <> | Subject | Re: [BENCHMARK] 100Hz v 1000Hz with contest |
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On Tue, 3 Jun 2003 18:00, Giuliano Pochini wrote: >> Is there any problem using a frequency other than 100 and 1000Hz ?
On Tue, Jun 03, 2003 at 08:36:49PM +1000, Con Kolivas wrote: > Not at all. These were chosen because they were the default 2.4 (100) and 2.5 > (1000) frequencies. The large difference in Hz was postulated to increase the > in-kernel overhead and the amount of time spent tearing down and building up > the cpu cache again. 2.4 running at 1000Hz shows poor performance at high > (>4) loads whereas 2.5 doesn't seem to do this. I originally thought it was > cache thrashing/trashing responsible. However since 2.5 performance is almost > comparable at 100/1000 it seems to be that the pure interrupt overhead in 2.5 > is lower?
You could try profiling cache misses etc.
I blame count_active_tasks(). =)
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