linux-kernel - Re: Pin-pointing the root of unusual application latencies

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Date:	Wed, 25 Jul 2007 15:38:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	John Sigler <linux.kernel@...e.fr>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Pin-pointing the root of unusual application latencies


* John Sigler <linux.kernel@...e.fr> 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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