linux-kernel - Re: A few questions and issues with dynticks, NOHZ and powertop

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Message-ID: <4BB95C85.80205@linux.intel.com>
Date:	Sun, 04 Apr 2010 20:44:05 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Dmitry Torokhov <dtor@...l.ru>
Subject: Re: A few questions and issues with dynticks, NOHZ and powertop

> And you did mention offlining some CPUs above.  The folloiwng patch
> (from Lai Jiangshan) is needed to handle this case.

btw on x86... don't offline CPUs if you want to save power.. it doesn't.
(at least not during idle.. and when you're busy it might save power, but it won't save you energy normally)
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