Hi,
* Solene Rapenne wrote:
> I'm proposing a very simple change to the automatic policy of the CPU
> frequency scheduler.
>
> Currently, every 100ms the scheduler is doing this:
>
> - when the CPU load exceeds the threshold, CPU frequency is set to the
> maximum and the variable downbeats is set to 5.
> - when the CPU load is below the threshold, downbeats is decremented, if
> it's == 0 then the CPU load is reduced to 0
>
> my proposal is to change the downbeat to be adaptive to the load, instead
> of setting it to 5 all the time, I propose to increment it with a limit
> of 5. Instead of having the frequency set at max for 500ms (5 cycles)
> every time the CPU usage is above the treshold, we will keep the
> frequency high for a number of cycles depending how long it was high
> (up to 5). So, in case of short CPU usage burst like opening a new MP3
> file for decoding or a click on a GUI, we have a frequency burst of
> 100ms instead of 500ms.
>
> I've been using it for a few days, I noticed a huge battery life
> improvement with no responsiveness change.
I have the patch running since the weekend (when it was first shared)
and noticed that my CPU on battery spins up less often than before. I
have the feeling that my battery lasts longer, however, I need to do
some more measurements to have a proof.
Cheers
Matthias
