linux-kernel - Re: Cryogenic: Enabling Power-Aware Applications on Linux

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Date:	Sat, 12 Apr 2014 00:05:17 +0200
From:	Pavel Machek <pavel@....cz>
To:	Christian Grothoff <christian@...thoff.org>
Cc:	Alejandra Morales <alejandra.morales@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Cryogenic: Enabling Power-Aware Applications on Linux

Hi!

> >> Cryogenic is the result of my Master's Thesis, completed at the Technical University
> >> of Munich under the supervision of Christian Grothoff. You can find more information
> >> about Cryogenic at https://gnunet.org/cryogenic
> > 
> > Do you have any measurements how much power it actually saves?
> 
> Yes, it depends on the device, but we have demonstrated power
> savings for two different types of devices using two different
> measurement setups performed by two independent groups.  Some
> of the measurements are available on the website, the second
> set should become available "soon" (but we can already say that
> for the scenario we measured, the savings are in the same range
> as before).

The video I seen.... AFAICT the savings are in <10% range?

> > "I'd like to download my mails from IMAP server in next 30
> > minutes. But... it would be better done when I'm on 3G network with
> > good signal (0.01W transmit power used for 3 seconds) than on GPRS
> > with poor signal (2W transmit power for 4 minutes)..."
> 
> Well, that's not quite what the API would allow, especially as it
> is obviously hard to predict that a different network will become
> available.

Actually... its a phone so it probably has GPS :-). But I'd guess that
even simpler logic, "if UMTS was available in last hour, it is likely
to be available within hour" would work ok.

I seen demo on UDP packets... delayed TCP socket write is probably
easy, but would API allow delayed TCP connect?

Hmm, but the API needs redoing, anyway, fcntl()?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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