Messages in this thread | | | Date | Mon, 13 Sep 2010 20:19:59 +0200 | From | Ingo Molnar <> | Subject | Re: [RFC PATCH] check_preempt_tick should not compare vruntime with wall time |
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* Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> 2.0GHz Pentium M > > * wakeup-latency.c (SIGEV_THREAD) with make -j10 > > - Mainline 2.6.35.2 kernel > > maximum latency: 45762.1 µs > average latency: 7348.6 µs > missed timer events: 0 > > - check_preempt fix > > maximum latency: 39858.9 µs > average latency: 7728.1 µs > missed timer events: 0
Note that the check_preempt fix, as i mentioned it in the previous mail, has no effect on this workload - so any effect you see is pure noise.
> - With only Peter's smaller min_gran (shown below): > > maximum latency: 29100.6 µs > average latency: 6684.1 µs > missed timer events: 0
That's the real improvement.
> - check_preempt fix + Peter's smaller min_gran: > maximum latency: 20433.0 µs > average latency: 5112.5 µs > missed timer events: 0
Again, pure noise effect.
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