On Wed, 3 Feb 2016, Longepe, Philippe wrote:
Thank you for sharing this test. I just did a quick test and yes this is
really interesting !
Without the scale option, the load is close to 100% for each cpus (so
the pstates are increasing up to the turbo frequency) but with
scale=320:208, the load is oscillating (close to 50% in average), so the
requested frequencies are lower (the power is also reduced).
I have a patch (not yet submitted) that reduce the gap for such a use case.
That's nice, glad the benchmark helped.
As a temporary solution, you can also switch to performance with:
sudo su
echo performance > /sys/devices/system/cpu/cpu*/scaling_governor
Yes, ok, thanks.
However, I still don't know why there is 50% of idle with the scale
option (is it using a Hw accelerator ?).
Mh. I don't know. I always thought this is stuff which is not that
threadable as the mpeg to mp4 conversion, or something like that?
Thanks,
Thomas
