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@xxxxxxx/
Signed-off-by: Christian Hewitt <christianshewitt@xxxxxxxxx>
---
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@xxxxxxx/
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