Date: Fri, 31 Oct 2008 13:17:21 -0400
From: Dave Jones <davej@redhat.com>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: sched domains oddness.
Message-ID: <20081031171721.GA8837@redhat.com>
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	Suresh Siddha <suresh.b.siddha@intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Linux Kernel <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>
References: <20081031162443.GA29885@redhat.com> <1225471911.7803.1596.camel@twins> <20081031170928.GB10468@linux-os.sc.intel.com>
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On Fri, Oct 31, 2008 at 10:09:29AM -0700, Suresh Siddha wrote:

 > > looks like someone is triggering rebuild_sched_domains(), is something
 > > poking cpusetfs files or flipping between sched_mc settings?
 > 
 > I remember someone mentioning that some distro's started setting
 > sched_mc_power_savings to '1' by default during boot. On a dual-core
 > laptop, this will not give any advantage.
 > 
 > I have to fix the code to not export this tunable, when we have only
 > socket in the system.
 > 
 > Dave, Is your distro also setting this tunable blindly during boot :(

(13:15:25:davej@vaio:~)$ cat /sys/devices/system/cpu/sched_mc_power_savings
0

So no, unless something set it to 1, and then back to 0.

A grep of etc shows up nothing in initscripts.  Does hal or something
play with this?

	Dave

-- 
http://www.codemonkey.org.uk
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