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Date: Sat, 5 Jun 2010 15:26:36 -0700
Message-ID: <AANLkTinRH52dSTPCAO9k1yEFup1LLYizeinunxeTBzbQ@mail.gmail.com>
Subject: Re: suspend blockers & Android integration
From: Brian Swetland <swetland@google.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: =?UTF-8?B?QXJ2ZSBIasO4bm5ldsOlZw==?= <arve@android.com>,
       Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       tytso@mit.edu, Neil Brown <neilb@suse.de>,
       Thomas Gleixner <tglx@linutronix.de>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Alan Stern <stern@rowland.harvard.edu>,
       Felipe Balbi <felipe.balbi@nokia.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Florian Mickler <florian@mickler.org>,
       Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
       Linux PM <linux-pm@lists.linux-foundation.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       James Bottomley <James.Bottomley@suse.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Kevin Hilman <khilman@deeprootsystems.com>,
       "H. Peter Anvin" <hpa@zytor.com>
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On Sat, Jun 5, 2010 at 3:23 PM, Arjan van de Ven <arjan@infradead.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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