powerd adaptive mode latching

John Baldwin jhb at freebsd.org
Wed Jan 16 07:13:33 PST 2008

On Saturday 12 January 2008 04:27:46 pm Maxim Sobolev wrote:
> I wonder if somebody did measurement of power consumption with powerd 
> and without it on typical tasks. There is very interesting idea in the 
> last issue of ACM Queue that it might be much more beneficial to run CPU 
> at the full speed and then switch it to low-power mode as soon as 
> possible in the idle loop than to run longer at reduced speed for a 
> longer period of time.

I haven't done hard tests, but even with C3 enabled on my laptop I find that
anecdotally I get longer battey life with powerd enabled.

John Baldwin

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