Possible Performance Regression with Mesa

[Joao Paulo Silva Goncalves]

On Thu, Apr 25, 2024 at 9:08 AM Lucas Stach <l.stach at pengutronix.de> wrote:
> I can reproduce the issue, but sadly there is no simple fix for this,
> as it's a bad interaction between some of the new features.
> At the core of the issue is the dmabuf-feedback support with the chain
> of events being as follows:

> 1. weston switches to the scanout tranche, as it would like to put the
> surface on a plane
> 2. the client reallocates as linear but does so on the render node
> 3. weston still isn't able to put the buffer on the plane, as it's
> still scanout incompatible due to being non-contig, so needs to fall
> back to rendering
> 4. now we are stuck at a linear buffer being used for rendering, which
> is very non-optimal

> I'll look into improving this, but can make no commitments as to when
> I'll be able to get around to this.

Seem to be tricky.
If you want, we at least can help you test it. Just reach out.
We also saw similar behaviour on more modern hardware, like the iMX8MM.
I will do a bit more testing on the iMX8MM and also some on the iMX8MP to
geather more data and
I am thinking in also opening an issue on the gitlab of Mesa, for better
tracking. What do you think?

Thanks for all the help Lucas.

Regards,
João Paulo Goncalves
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