Messages in this thread | | | Date | Tue, 11 Oct 2005 13:17:00 +0200 | From | Ingo Molnar <> | Subject | Re: Latency data - 2.6.14-rc3-rt13 |
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* Mark Knecht <markknecht@gmail.com> wrote:
> > ( softirq-timer/0-3 |#0): new 3997 us maximum-latency critical section. > > So the root cause of this 4mS delay is the 250Hz timer. If I change > the system to use the 1Khz timer then the time in this section drops, > as expected, to 1mS.
this was a bug in the critical-section-latency measurement code of x64. The timer irq is the one that leaves userspace running for the longest time, between two kernel calls.
I have fixed these bugs in -rc4-rt1, could you try it? It should report much lower latencies, regardless of PM settings.
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