linux-kernel - Re: [RFC v1] Tunable sched_mc_power

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Message-ID: <20080628122237.GA22099@srcf.ucam.org>
Date:	Sat, 28 Jun 2008 13:22:37 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, dipankar@...ibm.com,
	balbir@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n

On Fri, Jun 27, 2008 at 10:06:28AM +0200, Andi Kleen wrote:

> Ok distcc is a special case, but it doesn't apply to a lot of other
> processes (do you really want your CPU to crank up for "updatedb" or
> beagle or some backup job for example?)

If something's CPU-bound, then you almost certainly want to speed the 
CPU up. There's no power advantage to leaving it at a low frequency. I'd 
be surprised if things like beagle or updatedb are CPU-bound, though.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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