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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. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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