linux-kernel - Re: [RFC][PATCH 12/12] PM / r8169: Add simplified run-time PM support

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Message-ID: <20100104210040.GA20001@elf.ucw.cz>
Date:	Mon, 4 Jan 2010 22:00:40 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Oliver Neukum <oliver@...kum.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Francois Romieu <romieu@...zoreil.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC][PATCH 12/12] PM / r8169: Add simplified run-time PM
 support

> > > > Which means it saves 0.6W :-). Measuring power in Wh/h is "interesting".
> > > 
> > > You can't save power, you can only save energy.  Wh is just an energy unit.
> > 
> > Of course we can save power, you just did :-).
> > 
> > (And in some cases -- data centers, limited cooling -- you are limited
> > by power, not energy.
> 
> But still energy is what you pay for, isn't it?

Energy is what you pay for, but if you eat too much power, data centre
overheats and goes down.

> > You are right that on notebooks, energy is more important.)
> 
> You may require less power to run, so if that's what you mean by "saving", then
> I agree. :-)

Yes, that's what I meant by saving :-), and yes, they are very
related.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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