From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754565AbXDYAEK (ORCPT ); Tue, 24 Apr 2007 20:04:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754660AbXDYAEK (ORCPT ); Tue, 24 Apr 2007 20:04:10 -0400 Received: from mx1.redhat.com ([66.187.233.31]:50362 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754565AbXDYAEJ (ORCPT ); Tue, 24 Apr 2007 20:04:09 -0400 Date: Tue, 24 Apr 2007 20:03:27 -0400 From: Dave Jones To: Nish Aravamudan Cc: William Heimbigner , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: [RFC] [PATCH] cpufreq: allow full selection of default governors Message-ID: <20070425000327.GG22267@redhat.com> Mail-Followup-To: Dave Jones , Nish Aravamudan , William Heimbigner , linux-kernel@vger.kernel.org, Andrew Morton References: <20070424211253.GG23598@redhat.com> <29495f1d0704241505p62140160o52d83e383106bf8e@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <29495f1d0704241505p62140160o52d83e383106bf8e@mail.gmail.com> User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 24, 2007 at 03:05:36PM -0700, Nish Aravamudan wrote: > On 4/24/07, Dave Jones 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 -- http://www.codemonkey.org.uk