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

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Message-ID: <Pine.LNX.4.58.0807052038540.8466@gandalf.stny.rr.com>
Date:	Sat, 5 Jul 2008 20:39:46 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Wolfgang Grandegger <wg@...ndegger.com>
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?


On Wed, 2 Jul 2008, Wolfgang Grandegger wrote:

>
> 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.

Hmm, should be. But I need to test it on my PPC box first before I can
tell you for sure. If you don't see a way to enable it, perhaps I haven't
updated the config options for PPC yet.

-- Steve

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