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

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Message-ID: <486B37BF.6030107@grandegger.com>
Date:	Wed, 02 Jul 2008 10:09:35 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Luotao Fu <l.fu@...gutronix.de>,
	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 - RCU issue?

Steven Rostedt wrote:
> On Tue, 1 Jul 2008, Wolfgang Grandegger wrote:
>> I continue this thread because it's still not understood why enabling
>> CONFIG_RCU_TRACE is necessary to get reasonable latencies on the
>> MPC5200. It might also explain, why I get much worse latencies with
>> 2.6.25.8-rt7.
> 
> Have you tried turning on ftrace?

Hm, is it available for PowerPC? I have not found yet how to enable it.

Wolfgang.
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