linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090217215532.5ae533a6@infradead.org>
Date:	Tue, 17 Feb 2009 21:55:32 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	"Woodruff, Richard" <r-woodruff2@...com>,
	Brian Swetland <swetland@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Len Brown <lenb@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: [RFD] Automatic suspend

On Tue, 17 Feb 2009 21:11:31 -0800
Arve Hjønnevåg <arve@...roid.com> wrote:

> On Tue, Feb 17, 2009 at 4:04 PM, Arjan van de Ven
> <arjan@...radead.org> wrote:
> > On Tue, 17 Feb 2009 09:32:46 -0600
> > "Woodruff, Richard" <r-woodruff2@...com> wrote:
> >
> >> > so use range timers / timer slack for those apps that you do not
> >> > trust. That is not a big deal, and solves the issue of timer
> >> > wakeups...
> >>
> >> I not so sure it is that straight forward in practice.  End systems
> >> integrate a lot of 3rd party software who view performance 1st and
> >> have no thought of power.
> >
> > you know that with the range timers/slack, you can control the
> > "rounding" of the timer of the application, right?
> > You can *directly* throttle the number of wakeups an application
> > causes that way to a value you set.
> 
> I thought the point of range timers was to align multiple timers so
> they wakeup at the same time, not to throttle individual timers.

it works both ways.



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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