Messages in this thread | | | Subject | Re: [PATCH] drm/lima: add governor data with pre-defined thresholds | From | Lukasz Luba <> | Date | Wed, 27 Jan 2021 11:11:14 +0000 |
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On 1/27/21 10:24 AM, Lukasz Luba wrote: > Hi Christian, > > On 1/25/21 8:18 AM, Christian Hewitt wrote: >> This patch adapts the panfrost pre-defined thresholds change [0] to the >> lima driver to improve real-world performance. The upthreshold value has >> been set to ramp GPU frequency to max freq faster (compared to panfrost) >> to compensate for the lower overall performance of utgard devices. >> >> [0] >> https://patchwork.kernel.org/project/dri-devel/patch/20210121170445.19761-1-lukasz.luba@arm.com/ >> >> >> Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> >> --- >> I have been using Kodi as my test application. If you scroll in library >> views with hundreds of list items and the panfrost values the slow GPU >> ramp up is quite noticeable and the GUI feels sluggish. As everything >> lima runs on is inherently slower than panfrost using devices I believe >> it's better to ramp up to max freq quicker. > > It's quite low value for the upthreshold, but I believe you have > experimented and observed that a bit higher (30, 40?) don't work well. > I don't know the Kodi system, though. > > You can check if the other frequencies are also used in statistics for > devfreq device: > cat /sys/class/devfreq/<your_gpu>/trans_stats > > If they are also used, then it OK (better than stuck at min freq).
I've just realized that your board might suffer a another issue. Please apply this patch [1] and run your experiments with upthresholds.
[1] https://lore.kernel.org/lkml/20210127105121.20345-1-lukasz.luba@arm.com/
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