linux-kernel - Re: cpufreq default governor

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Date:	Tue, 24 Apr 2007 15:07:57 +0200
From:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>
To:	"William Heimbigner" <icxcnika@....tar.cc>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: cpufreq default governor

On 24/04/07, William Heimbigner <icxcnika@....tar.cc> wrote:
> 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?

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.

>
> William Heimbigner
> icxcnika@....tar.cc
>

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)
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