linux-kernel - Re: [RFC][PATCH 0/3] c-state governor changes

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Message-ID: <20120824041108.GC3001@srcf.ucam.org>
Date:	Fri, 24 Aug 2012 05:11:08 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, ShuoX Liu <shuox.liu@...el.com>,
	Boris Ostrovsky <boris.ostrovsky@....com>,
	Len Brown <len.brown@...el.com>,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 0/3] c-state governor changes

On Thu, Aug 23, 2012 at 02:54:05PM -0700, Arjan van de Ven wrote:
> On 8/23/2012 2:11 PM, Rik van Riel wrote:
> > This patch set is mostly there to kick off a discussion in time
> > for Kernel Summit.  When running it on my laptop, with acpi_idle,
> > I see a promising change in powertop.
> 
> be careful with acpi_idle... that will remove most of the intermediate C states the platform has,
> so the policy engine no longer has good things to chose from.

Not inherently - intel_idle typically only exports 4 C states, and many 
ACPI platforms will provide the same number, especially when on battery.

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