linux-kernel - Re: [RFC] [PATCH] cpufreq: allow full selection of default governors

Open Source and information security mailing list archives

Message-ID: <20070425000327.GG22267@redhat.com>
Date:	Tue, 24 Apr 2007 20:03:27 -0400
From:	Dave Jones <davej@...hat.com>
To:	Nish Aravamudan <nish.aravamudan@...il.com>
Cc:	William Heimbigner <icxcnika@....tar.cc>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] [PATCH] cpufreq: allow full selection of default governors

On Tue, Apr 24, 2007 at 03:05:36PM -0700, Nish Aravamudan wrote:
 > On 4/24/07, Dave Jones <davej@...hat.com> wrote:
 > > On Tue, Apr 24, 2007 at 09:03:23PM +0000, William Heimbigner wrote:
 > >  > The following patches should allow selection of conservative, powersave, and
 > >  > ondemand in the kernel configuration.
 > >
 > > This has been rejected several times already.
 > > Ondemand and conservative isn't a viable governor for all cpufreq
 > > implementations (ie, ones with high switching latencies).
 > 
 > This piques my curiosity -- some governors don't work with some
 > cpufreq implementations. Are those implementations in the kernel or in
 > userspace? If in the kernel, then perhaps there should be some
 > dependency expressed there in Kconfig between cpufreq implementation
 > and the available governors

it can't be solved that easily. powernow-k8 for example is fine to
use with ondemand on newer systems, where the latency is low.
On older models however, it isn't.

 > > Also, see the
 > > comment in the Kconfig a few lines above where you are adding this.
 > 
 > Are these governors unfixable? If

tbh, I've forgotten the original issues that caused the comment
to be placed there. Dominik ?

 > Just looking for more info -- feel free to just point me at the archives.

cpufreq-list archives are at http://lists.linux.org.uk/mailman/listinfo/cpufreq
(though only available to list members)

	Dave

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