From: Pavel Machek <pavel@ucw.cz>
To: Vitaly Wool <vitalywool@gmail.com>
Cc: linux-pm@lists.osdl.org, Amit Kucheria <amit.kucheria@nokia.com>,
Matthew Locke <matthew.a.locke@comcast.net>,
scott.preece@motorola.com
Subject: Re: nokia 770 [was Re: community PM requirements/issues and PowerOP]
Date: Thu, 14 Dec 2006 14:56:10 +0000 [thread overview]
Message-ID: <20061214145609.GA4451@ucw.cz> (raw)
In-Reply-To: <acd2a5930612140501n3f287693i3670d836a82f9369@mail.gmail.com>
> >But what sense does it make for a user,sysadmin or
> >application
> >to change voltage? If any of these want to save power,
> >they do so
> >by a) doing less work, and then b) lowering the clock
> >speed as this
> >is inherently tied to voltage.
>
> It makes sense to perform changing an operating point
> dynamically in
> userland.
In very special cases, yes.
> That said, voltage should be accessible from userland.
Why?
If few states differ in voltage but not frequency, the only
user-visible thing is different latency of enter/exit.
If you only have two voltages per frequency (as it was shown in
examples here)... just add 1Hz to make difference between the two.
...but I guess you should teach cpufreq's ondemand governor to deal
with different latencies for different voltages. Before that is done
and shown to have significant power-saving impact, userspace interface
debate is useless.
Pavel
--
Thanks for all the (sleeping) penguins.
next prev parent reply other threads:[~2006-12-14 14:56 UTC|newest]
Thread overview: 144+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-11 7:57 community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?] Eugeny S. Mints
2006-09-11 8:20 ` Pavel Machek
2006-09-11 9:47 ` Eugeny S. Mints
2006-09-11 19:36 ` Pavel Machek
2006-09-11 19:53 ` Matthew Locke
2006-09-11 20:06 ` Pavel Machek
2006-09-11 20:09 ` Pavel Machek
2006-09-11 20:33 ` Matthew Locke
2006-09-11 21:06 ` Pavel Machek
2006-09-11 21:50 ` Matthew Locke
2006-09-11 22:50 ` Pavel Machek
2006-09-12 3:31 ` Greg KH
2006-09-12 8:26 ` Matthew Locke
2006-09-13 4:22 ` David Brownell
2006-09-11 20:25 ` Matthew Locke
2006-09-11 21:02 ` Pavel Machek
2006-09-12 3:26 ` Greg KH
2006-09-11 22:00 ` Mark Gross
2006-09-11 22:08 ` Matthew Locke
2006-09-11 20:24 ` Eugeny S. Mints
2006-09-11 20:34 ` Pavel Machek
2006-09-13 4:54 ` David Brownell
2006-09-13 11:39 ` Preece Scott-PREECE
2006-09-14 9:12 ` Pavel Machek
2006-09-14 9:16 ` Vitaly Wool
2006-09-14 9:20 ` Matthew Locke
2006-09-14 10:05 ` Eugeny S. Mints
2006-09-14 10:17 ` Pavel Machek
2006-09-14 10:47 ` Eugeny S. Mints
2006-09-14 10:47 ` [linux-pm] " Eugeny S. Mints
2006-09-14 12:15 ` Vitaly Wool
2006-09-14 13:03 ` Pavel Machek
2006-09-14 13:04 ` Pavel Machek
2006-09-14 13:15 ` Vitaly Wool
2006-09-14 13:20 ` Pavel Machek
2006-09-14 13:26 ` Vitaly Wool
2006-09-14 14:59 ` David Brownell
2006-09-17 10:53 ` Amit Kucheria
2006-09-17 13:18 ` Pavel Machek
2006-09-17 13:28 ` Amit Kucheria
2006-09-17 13:40 ` Pavel Machek
2006-09-17 14:14 ` Amit Kucheria
2006-09-17 18:25 ` community PM requirements/issues and PowerOP[Was: " Preece Scott-PREECE
2006-09-18 9:02 ` community PM requirements/issues and PowerOP [Was: " Pavel Machek
2006-09-14 14:56 ` David Brownell
2006-09-17 12:34 ` Pavel Machek
2006-09-17 13:06 ` Vitaly Wool
2006-09-18 10:46 ` Amit Kucheria
2006-09-18 10:53 ` Pavel Machek
2006-09-18 12:01 ` Igor Stoppa
2006-09-18 12:11 ` nokia 770 [was Re: community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?]] Pavel Machek
2006-09-18 12:42 ` Amit Kucheria
2006-09-19 18:25 ` Pavel Machek
2006-12-12 20:00 ` nokia 770 [was Re: community PM requirements/issues and PowerOP] David Brownell
2006-12-13 12:12 ` Eugeny S. Mints
2006-12-13 21:03 ` Pavel Machek
2006-12-13 21:32 ` David Brownell
2006-12-13 21:44 ` Matthew Locke
2006-12-13 21:53 ` Dave Jones
2006-12-13 22:50 ` Matthew Locke
2006-12-13 22:58 ` Dave Jones
2006-12-14 10:14 ` Dmitry Krivoschekov
2006-12-14 12:12 ` Dave Jones
2006-12-14 13:01 ` Vitaly Wool
2006-12-14 13:17 ` Dave Jones
2006-12-14 14:56 ` Pavel Machek [this message]
2006-12-14 15:22 ` Dmitry Krivoschekov
2006-12-13 22:55 ` nokia 770 [was Re: community PM requirements...] David Brownell
2006-12-13 21:56 ` nokia 770 [was Re: community PM requirements/issues and PowerOP] Eugeny S. Mints
2006-12-13 21:58 ` Pavel Machek
2006-12-13 22:27 ` nokia 770 [was Re: community PM requirements...] David Brownell
2006-12-13 21:27 ` nokia 770 [was Re: community PM requirements/issues and PowerOP] Matthew Locke
2006-09-14 19:25 ` community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?] Jon Loeliger
2006-09-17 12:46 ` Pavel Machek
2006-09-17 17:32 ` Preece Scott-PREECE
2006-09-19 18:20 ` Pavel Machek
2006-09-19 19:11 ` Preece Scott-PREECE
2006-09-23 23:39 ` Pavel Machek
2006-09-14 12:12 ` Vitaly Wool
2006-09-14 12:35 ` Eugeny S. Mints
2006-09-14 9:32 ` PowerOP on lkml or linux-pm? Matthew Locke
2006-09-14 9:45 ` Pavel Machek
2006-09-14 9:58 ` Matthew Locke
2006-09-14 9:47 ` community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?] Matthew Locke
2006-09-11 19:30 ` Matthew Locke
2006-09-11 19:55 ` Pavel Machek
2006-09-11 20:53 ` Eugeny S. Mints
2006-09-11 21:00 ` Pavel Machek
2006-09-11 21:36 ` Preece Scott-PREECE
2006-09-11 21:39 ` Pavel Machek
2006-09-11 22:41 ` Eugeny S. Mints
2006-09-11 23:05 ` cpufreq user<->kernel interface removal [was Re: community PM requirements/issues and PowerOP] Pavel Machek
2006-09-11 23:50 ` Mark Gross
2006-09-12 3:35 ` Greg KH
2006-09-12 8:41 ` Matthew Locke
2006-09-12 17:03 ` Jon Loeliger
2006-09-14 16:26 ` Mark Gross
2006-09-17 12:37 ` Pavel Machek
2006-09-17 13:10 ` Vitaly Wool
2006-09-17 13:20 ` Pavel Machek
2006-09-11 22:05 ` community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?] Eugeny S. Mints
2006-09-11 22:56 ` cpufreq terminally broken [was Re: community PM requirements/issues and PowerOP] Pavel Machek
2006-09-11 22:56 ` Pavel Machek
2006-09-12 0:17 ` Mark Gross
2006-09-12 3:37 ` Greg KH
2006-09-13 23:50 ` [linux-pm] " David Singleton
2006-09-14 5:30 ` Vitaly Wool
2006-09-14 5:30 ` [linux-pm] " Vitaly Wool
2006-09-14 5:55 ` OpPoint summary Greg KH
2006-09-14 7:35 ` Vitaly Wool
2006-09-14 7:35 ` [linux-pm] " Vitaly Wool
2006-09-14 16:55 ` David Singleton
2006-09-14 17:03 ` David Singleton
2006-09-14 17:07 ` David Singleton
2006-09-14 17:25 ` Auke Kok
2006-09-14 17:25 ` Auke Kok
2006-09-14 18:15 ` [linux-pm] " Vitaly Wool
2006-09-14 18:17 ` David Singleton
2006-09-17 17:48 ` Pavel Machek
2006-09-18 14:33 ` [linux-pm] " Richard A. Griffiths
2006-09-18 16:13 ` Matthew Locke
2006-09-18 16:13 ` [linux-pm] " Matthew Locke
2006-09-14 17:11 ` David Singleton
2006-09-17 5:07 ` David Singleton
2006-09-17 12:56 ` Pavel Machek
2006-09-17 12:58 ` Pavel Machek
2006-09-17 22:43 ` [linux-pm] " Matthew Locke
2007-02-27 20:55 ` cpufreq terminally broken [was Re: community PM requirements/issues and PowerOP] David Brownell
2007-02-27 22:41 ` Matthew Locke
2006-09-12 8:33 ` Pavel Machek
2006-09-12 8:33 ` Pavel Machek
2006-09-12 9:10 ` Vitaly Wool
2006-09-12 9:10 ` [linux-pm] " Vitaly Wool
2006-09-12 9:16 ` Pavel Machek
2006-09-12 9:16 ` [linux-pm] " Pavel Machek
2006-09-12 9:23 ` Vitaly Wool
2006-09-14 15:04 ` Mark Gross
2006-09-14 15:04 ` [linux-pm] " Mark Gross
2006-09-14 14:58 ` Mark Gross
2006-10-05 3:30 ` community PM requirements/issues and PowerOP [Was: Re: So, what's the status on the recent patches here?] Dominik Brodowski
2006-09-11 21:53 ` Mark Gross
2006-09-11 22:43 ` Pavel Machek
2006-09-12 0:00 ` Mark Gross
-- strict thread matches above, loose matches on Subject: below --
2006-12-14 14:16 nokia 770 [was Re: community PM requirements/issues and PowerOP] Scott E. Preece
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