Date: Thu, 17 Jan 2008 11:15:02 +0100 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: "Daniel O'Connor" <doconnor@gsoft.com.au> Cc: njl@freebsd.org, bruno@freebsd.org, Stefan Lambrev <stefan.lambrev@moneybookers.com>, freebsd-current@freebsd.org, Igor Mozolevsky <igor@hybrid-lab.co.uk>, Maxim Sobolev <sobomax@digifonica.com> Subject: Re: powerd adaptive mode latching Message-ID: <86myr4n4gp.fsf@ds4.des.no> In-Reply-To: <200801171115.43663.doconnor@gsoft.com.au> (Daniel O'Connor's message of "Thu\, 17 Jan 2008 11\:15\:35 %2B1030") References: <a2b6592c0801110351l382959ffh1d55f2bcd2e6ca1b@mail.gmail.com> <a2b6592c0801111119r148d3697hf75a59b7bf74d540@mail.gmail.com> <478930D2.90806@digifonica.com> <200801171115.43663.doconnor@gsoft.com.au>
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"Daniel O'Connor" <doconnor@gsoft.com.au> writes: > One problem with it is that it lags behind actual usage by a few > seconds (presumably averaging it). It is based on the (didle/dt) / (dtotal/dt) fraction computed from kern.cp_time, which can take a while to ramp up. This is not easily seen in a cursory reading of the code, as the fraction is computed in a very roundabout way. > Turning the LCD off saves about 4W too. Hmm, it would be interesting to experiment with varying backlight brightness based on system load :) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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