Re: Pin-pointing the root of unusual application latencies

[Ingo Molnar]

* John Sigler <linux.kernel@xxxxxxx> wrote:

> > does your test-app have higher priority than softirq--4 ?
> 
> PID 4 is [softirq-timer/0] and has priority 50 in SCHED_FIFO. My 
> process has priority 80 in SCHED_RR. It is waiting for IRQ10.
> 
> My user-space app has higher priority than everything except PID 2 
> which is [posix_cpu_timer]

well what priority does the IRQ 10 kernel thread have? It should be prio 
80 too if it's in your critical path.

	Ingo
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