linux-kernel - Re: suspend blockers & Android integration

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Message-ID: <AANLkTinRH52dSTPCAO9k1yEFup1LLYizeinunxeTBzbQ@mail.gmail.com>
Date:	Sat, 5 Jun 2010 15:26:36 -0700
From:	Brian Swetland <swetland@...gle.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, tytso@....edu,
	Neil Brown <neilb@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	James Bottomley <James.Bottomley@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: suspend blockers & Android integration

On Sat, Jun 5, 2010 at 3:23 PM, Arjan van de Ven <arjan@...radead.org> wrote:
>>
>> We clearly have different standards for what we consider good. We
>> measure time suspended in minutes or hours, not seconds, and waking up
>> every second or two causes a noticeable decrease in battery life on
>> the hardware we have today.
>
> I guess I'm spoiled working with (unreleased) hardware that knows how
> to power gate ;-)

I'm continually surprised by answers like this.  We run on hardware
that power gates very aggressively and draws in the neighborhood of
1-2mA at the battery when in the lowest state (3-5mA while the radio
is connected to the network and paging).  Waking up out of that lowest
state and executing code every few seconds or (worse) several times a
second) will raise your average power consumption.  Being able to stay
parked at the very bottom for minutes or hours at a time when nothing
"interesting" is happening is very useful and can have a significant
impact on overall battery life.

Brian
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