Messages in this thread | | | Date | Wed, 3 Feb 2016 20:18:21 +0100 (CET) | From | Thomas Voegtle <> | Subject | RE: Performance drop on Baytrail with 4.5-rc2 |
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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
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