From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161762AbXDXNZb (ORCPT ); Tue, 24 Apr 2007 09:25:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161763AbXDXNZb (ORCPT ); Tue, 24 Apr 2007 09:25:31 -0400 Received: from [70.254.190.220] ([70.254.190.220]:57653 "EHLO server.willdawg" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1161762AbXDXNZa (ORCPT ); Tue, 24 Apr 2007 09:25:30 -0400 Date: Tue, 24 Apr 2007 13:25:30 +0000 (GMT) From: William Heimbigner X-X-Sender: icxcnika@server.thyself To: Michal Piotrowski cc: linux-kernel@vger.kernel.org Subject: Re: cpufreq default governor In-Reply-To: <6bffcb0e0704240607s2e9b308dx448b5f477b8325e@mail.gmail.com> Message-ID: References: <6bffcb0e0704240134w45007473p5694718a0aae08fc@mail.gmail.com> <6bffcb0e0704240550x2c47cd1ap8101a9b0db5c6c7d@mail.gmail.com> <6bffcb0e0704240607s2e9b308dx448b5f477b8325e@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 24 Apr 2007, Michal Piotrowski wrote: > On 24/04/07, William Heimbigner wrote: >> On Tue, 24 Apr 2007, Michal Piotrowski wrote: >> >> > On 24/04/07, William Heimbigner wrote: >> > > On Tue, 24 Apr 2007, Michal Piotrowski wrote: >> > > >> > > > Hi William, >> > > > >> > > > On 24/04/07, William Heimbigner wrote: >> > > > > Question: is there some reason that kconfig does not allow for >> > > > > default >> > > > > governors of conservative/ondemand/powersave? >> > > > >> > > > Performance? >> > > > >> > > > > I'm not aware of any reason why one of those governors could not >> > > > > be >> > > > > used >> > > > > as default. >> > > > >> > > > My hardware doesn't work properly with ondemand governor. I hear >> > > > strange noises when frequency is changed. >> > > > >> > > >> > > That doesn't mean it isn't working, though. >> > >> > I didn't say that cpufreq ondemand is broken. It's a hardware problem. >> > >> > > I here weird noises if the cpu >> > > is clocked anywhere from 333MHz to 1GHz (sounds like an RD-D2 beeping >> > > noises in ultra high pitch?) >> > >> > Yes, something like that. >> >> Is it actually "not working" though, even at the hardware level? > > It works, but for me this sounds are very weird ;) > >> To my >> knowledge those noises are normal, and aren't even signs of a harware >> problem. I believe it is the natural result of changing frequencies at any >> time. If you change frequencies, especially in the low end of available >> frequencies, you should hear a very brief noise. A governor such as >> ondemand, which is rapidly switching the frequency from say, 333 MHz to >> 2.66 GHz, is likely to make this much more noticable. > > Ok, it might be normal behavior. I might be wrong, but IMO users > prefer speed and no strange sounds as default setting. I agree! My suggestion, however, is that if they do want a different scheduler as the default, they can choose one. There are some cases in which this could be very useful. A couple examples would be the processor with poor cooling that overheats easily, or a laptop with a poor battery. However, on second thought with regards to Kconfig, would it be feasible to have performance always be the default, unless a "cpufreqgov=conservative" arguement was specified on the command line? This would be less susceptible to users complaining that their cpu is chirping all of a sudden. William Heimbigner icxcnika@mar.tar.cc