linux-kernel - Re: [ANNOUNCE] 2.6.31-rc6-rt5

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Message-ID: <20090820152931.GA5731@in.ibm.com>
Date:	Thu, 20 Aug 2009 20:59:31 +0530
From:	Dinakar Guniguntala <dino@...ibm.com>
To:	john stultz <johnstul@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Carsten Emde <ce@...g.ch>,
	Clark Williams <williams@...hat.com>,
	Frank Rowand <frank.rowand@...sony.com>,
	Robin Gareus <robin@...eus.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Philippe Reynes <philippe.reynes@...smpp.fr>,
	Fernando Lopez-Lezcano <nando@...ma.stanford.edu>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	Darren Hart <dvhltc@...ibm.com>, Jan Blunck <jblunck@...e.de>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Jon Masters <jcm@...hat.com>
Subject: Re: [ANNOUNCE] 2.6.31-rc6-rt5

On Wed, Aug 19, 2009 at 07:19:02PM -0700, john stultz wrote:
> On Wed, Aug 19, 2009 at 2:48 PM, Thomas Gleixner<tglx@...utronix.de> wrote:
> > We are pleased to announce the next update to our new preempt-rt
> > series.
> 
> Hey Thomas, Peter, Ingo,
>     I'm still seeing the odd SMP scheduler behavior (where all the
> processes line up on a single cpu) with -rt5. This can be easily
> reproduced with a "make -j8 bzImage".  I'm I the only one seeing this?

I am seeing it with 2.6.31-rcX-rtY kernels on both a 8 CPU AMD/Intel box
Specjbb was returning pathetically low numbers which turns out to be
because all threads are running on just one of the cpus

	-Dinakar


>  Any suggestions on further debugging this?
> 
> thanks
> -john
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