linux-kernel - Re: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc

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Date:	Wed, 23 Jan 2008 07:50:19 -0800
From:	Daniel Walker <dwalker@...sta.com>
To:	Luotao Fu <l.fu@...gutronix.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc


On Wed, 2008-01-23 at 15:53 +0100, Luotao Fu wrote:

> I was doing some tests on my mpc5200b Board to reproduce the high latency as
> measured by wolfgang.
> 
> I ran some tests with 
> while [ 1 ]; do ls /bin;done
> as non-rt workload, as in Wolfgangs Scenario.
> 

Can you try enabling CRITICAL_PREEMPT_TIMING only, and not latency
tracing .. You won't get a trace, but you will get some indication of
the start/stop points of the latency if it's preempt latency, and a
measurement of the longest latency..

Daniel

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