linux-kernel - Re: cpufreq default governor

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Message-ID: <Pine.LNX.4.64.0704241252410.25153@server.thyself>
Date:	Tue, 24 Apr 2007 12:56:03 +0000 (GMT)
From:	William Heimbigner <icxcnika@....tar.cc>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: cpufreq default governor

On Tue, 24 Apr 2007, Michal Piotrowski wrote:

> On 24/04/07, William Heimbigner <icxcnika@....tar.cc> wrote:
>>  On Tue, 24 Apr 2007, Michal Piotrowski wrote:
>> 
>> >  Hi William,
>> > 
>> >  On 24/04/07, William Heimbigner <icxcnika@....tar.cc> 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? 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.

William Heimbigner
icxcnika@....tar.cc
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