From: Dave Jones <davej@redhat.com>
To: st3@riseup.net
Cc: cpufreq@lists.linux.org.uk, linux-kernel@vger.kernel.org
Subject: Re: enhanced intel speedstep feature was Re: speedstep-centrino on dothan
Date: Thu, 7 Jul 2005 16:06:48 -0400 [thread overview]
Message-ID: <20050707200648.GA29142@redhat.com> (raw)
In-Reply-To: <20050707220027.413343d4@horst.morte.male>
On Thu, Jul 07, 2005 at 10:00:27PM +0200, st3@riseup.net wrote:
> Enabling, say, a duty cycle of 12.5% means that the CPU chip will be driven
> by clock just one time every eight, thus reducing power consumption and
> temperature (and it speeds down dramatically the CPU, too =).
>
> I tested it so far on my Pentium M Dothan 715 and on a Dothan 725.
>
> What do you think, could this be useful? I could provide a patch or a
> stand-alone module. Should I write an interface to sysfs?
You just reinvented the p4-clockmod driver :-)
This hasn't been seen to save any power whatsoever that I've seen.
I've heard a few reports that it reduces heat for a few folks, but
betting on it increasing your battery life is probably a push.
Dave
WARNING: multiple messages have this Message-ID (diff)
From: Dave Jones <davej@redhat.com>
To: st3@riseup.net
Cc: linux-kernel@vger.kernel.org, cpufreq@lists.linux.org.uk
Subject: Re: enhanced intel speedstep feature was Re: speedstep-centrino on dothan
Date: Thu, 7 Jul 2005 16:06:48 -0400 [thread overview]
Message-ID: <20050707200648.GA29142@redhat.com> (raw)
In-Reply-To: <20050707220027.413343d4@horst.morte.male>
On Thu, Jul 07, 2005 at 10:00:27PM +0200, st3@riseup.net wrote:
> Enabling, say, a duty cycle of 12.5% means that the CPU chip will be driven
> by clock just one time every eight, thus reducing power consumption and
> temperature (and it speeds down dramatically the CPU, too =).
>
> I tested it so far on my Pentium M Dothan 715 and on a Dothan 725.
>
> What do you think, could this be useful? I could provide a patch or a
> stand-alone module. Should I write an interface to sysfs?
You just reinvented the p4-clockmod driver :-)
This hasn't been seen to save any power whatsoever that I've seen.
I've heard a few reports that it reduces heat for a few folks, but
betting on it increasing your battery life is probably a push.
Dave
next prev parent reply other threads:[~2005-07-07 20:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-06 9:22 speedstep-centrino on dothan st3
2005-07-06 14:06 ` Dominik Brodowski
2005-07-06 19:45 ` st3
2005-07-06 16:30 ` Pedro Ramalhais
2005-07-06 19:58 ` Bill Davidsen
2005-07-06 21:11 ` Dave Jones
2005-07-06 21:55 ` st3
2005-07-07 20:00 ` enhanced intel speedstep feature was " st3
2005-07-07 20:06 ` Dave Jones [this message]
2005-07-07 20:06 ` Dave Jones
2005-07-07 20:22 ` st3
2005-07-07 20:22 ` st3
2005-07-07 20:40 ` Dave Jones
2005-07-07 20:40 ` Dave Jones
2005-07-07 20:51 ` Joseph Pingenot
2005-07-07 21:08 ` Dominik Brodowski
2005-07-07 21:34 ` Joseph Pingenot
2005-07-07 21:34 ` Joseph Pingenot
2005-07-07 21:51 ` Dominik Brodowski
2005-07-07 21:10 ` Dominik Brodowski
2005-07-07 21:10 ` Dominik Brodowski
2005-07-07 21:22 ` st3
2005-07-07 21:22 ` st3
2005-07-07 21:29 ` Dominik Brodowski
2005-07-07 21:29 ` Dominik Brodowski
2005-07-07 21:59 ` st3
2005-07-08 5:10 ` Dominik Brodowski
2005-07-08 5:10 ` Dominik Brodowski
2005-07-08 8:58 ` st3
2005-07-08 8:58 ` st3
2005-07-08 10:59 ` Nikolay Pelov
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