Re: [RFD] Automatic suspend

mark gross
2009-02-18T00:45:47Z

On Mon, Feb 16, 2009 at 11:23:30PM +0000, Matthew Garrett wrote:
> On Tue, Feb 17, 2009 at 12:19:38AM +0100, Rafael J. Wysocki wrote:
>
> > This, again, seems to be a bit x86-centric. :-) The Android people are telling
> > us that on the hardware they deal with it does make sense to put the entire
> > system to sleep even for relatively short periods of time, since the latencies
> > involved are not too bad.
>
> Arve said that the power state was equivalent in idle and suspend, but
> that they preferred suspend because it stopped any periodic timers. I'd
> be more interested in making sure that unnecessary timers aren't running
> than focusing on automatically entering system-wide suspend - Nokia have
> been managing this since 2005 with good results.
>

I think they where talking timers as hardware devices pulling electrons,
not SW timers triggering wake ups. I guess the timer hardware could be
running, and pulling power, even when not programmed to trigger any
event or IRQ.

--mgross