Hello, guys.

Ivaylo Dimitrov <ivo.g.dimitrov.75@???> wrote:
> Could be, afaik Nokia did lots of work trying to squeeze the last bit of
> performance from powervr

Ivaylo, it's not about squeezing the last bit of performance.
It's about 5 FPS vs 50 FPS.

Merlijn Wajer <merlijn@???> wrote:
> OK. As I indicated above, I feel the same way. But I can't help but
> wonder if such an exercise this will bring us closer to understanding
> the 'hang' in powervr userspace<->kernel interaction. Since it just
> doesn't happen with old clutter and old hildon-desktop. So I am trying
> to answer the question: what change in either clutter or hildon-desktop
> would cause this?

This part of work is already done by me a while ago. I guess I found the
cause of the hang. The functions calls trace that leads to 2+ minutes hang
on hildon-desktop startup is in attachment, see file "hildon-desktop".

I did a simple "monkey" patch to fix the hang. If you are interested,
please check the second attachment "hang-fix.patch". Note: it's just
quick and dirty workaround, not a real fix. And yes, it's for cogl.

If you guys really want to migrate to new clutter/cogl frameworks, I'd
recommend to stop using deprecated functions.

--
Best regards, Spinal