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

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Message-ID: <20140412113653.GA10806@Nokia-N900>
Date:	Sat, 12 Apr 2014 13:36:53 +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!

> >> 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?
> 
> For the scenario we scripted, yes. But note that we only
> allowed 50% of the packets transmitted to be delayed (a bit).
> If you were to increase the allowed delay or allowed a larger
> fraction of packets to be delayed, you should see larger savings.
> 
> > I seen demo on UDP packets... delayed TCP socket write is probably
> > easy, but would API allow delayed TCP connect?
> 
> Yes.
> 
> > Hmm, but the API needs redoing, anyway, fcntl()?
> 
> Depends --- while I like the idea, I did not hear enough to be
> certain that having this feature embedded in such a non-modular
> way was already the consensus (and I do not see a reasonable
> way to change the API this way while maintaining the modularity
> of the current code).

Being modular is not important for small piece of code like
this. Having reasonable interface is...

						Pavel
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