Power consumption tuning

Solène Rapenne solene at perso.pw
Tue Aug 9 15:03:51 UTC 2016

Le 2016-08-09 16:23, Aleksander Alekseev a écrit :
> Hello.
> I'm exploring how power consumption could be tuned on FreeBSD 11.0. I
> discovered a few useful articles, for instance [1]. Also useful pieces
> of advice were given on IRC. Resulting list is for now like this:
> * Use lightweight software (i3, GTK based GUI applications, etc), turn
>   off unused kernel modules, don't use full disc encryption, etc
> * Reduce CPU frequency (sysctl dev.cpu.0.freq), use powerd to do it
>   automatically
> * Reduce display brightness (sudo pkg install intel-backlight)
> * Enable power save mode on NIC (sudo ifconfig wlan0 powersave)
> * Disable unused USB devices (sudo usbconfig -d X.Y power_off)
> * Reduce clock frequency (kern.hz = 100)
> * Make sure your kernel is built without INVARIANTS and WITNESS
> Perhaps there are other methods I didn't notice? For instance are there
> any other sysctl parameters or kernel configuration options worth
> trying?
> [1] https://wiki.freebsd.org/TuningPowerConsumption


Buying a device to measure the power consumption is also a good idea, so 
you can check your changes.
It costs around 12€. Example http://www.ecvv.com/product/1000019919.html

and better, it can be used to check everything at home after you're done 
with the computer :D

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