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

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Date:	Sun, 3 Jan 2010 20:55:45 +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


> > On notebooks, you can often use
> > 
> > pavel@amd:/data/l/linux-msm/arch/arm/mach-msm$ cat
> > /proc/acpi/battery/BAT0/state 
> > present:                 yes
> > capacity state:          ok
> > charging state:          charged
> > present rate:            0 mW
> > remaining capacity:      71830 mWh
> > present voltage:         16277 mV
> > 
> > ...present rate is often usable-enough.
> 
> Using /proc/acpi/battery/BAT1/state I measured the energy drawn in 10 minutes
> both with the network adapter in D0 and D3hot.  The results were that with the
> network adapter in D0 the box drew 2476 mWh, while with the network adapter in
> D3hot it drew 2361 mWh.  The difference is 115 mWh, or about 5% on this
> particular box.
> 
> This means about 0.1 Wh in 10 minutes, so we can save about 0.6 Wh per hour.

Which means it saves 0.6W :-). Measuring power in Wh/h is
"interesting". Ok, that's consistent with my experiments, ethernet
transciever was around 1W... Thanks.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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