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

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Message-ID: <20070725130536.GA12334@elte.hu>
Date:	Wed, 25 Jul 2007 15:05:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	John Sigler <linux.kernel@...e.fr>
Cc:	linux-rt-users@...r.kernel.org,
	oprofile-list@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Pin-pointing the root of unusual application latencies


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

> >With a pair of the following in the middle:
> >
> >softirq--4     0....  670us : call_rcu (rt_run_flush)
> >softirq--4     0D..1  670us : __rcu_advance_callbacks (call_rcu)

> Any idea what went wrong in the above function trace? Why is the 
> kernel spinning in circles that way?

does your test-app have higher priority than softirq--4 ?

	Ingo
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