(In reply to comment #58)
> (In reply to comment #57)
> > I'm trying drm-next-3.18 and mesa git and many unreal engine demos are still
> > broken like this:
> > https://www.youtube.com/watch?v=NvgA9_B0dMo
> 
> Are you sure that's directly related to the Unigine Heaven stuttering
> discussed in this report? E.g., does reverting the Mesa commit in question
> help, or do you see similar symptoms in the Gallium HUD?

It does look like the same symptoms. Only rare and short hangs in unigine
heaven, but frequent hangs of ~1-2 sconds in unigine valley. The HUD shows that
these hangs mostly correlate with jumps in vram/gtt usage.

Is the mesa commit in question 150ac07b855b5c5f879bf6ce9ca421ccd1a6c938? If so,
it doesn't revert cleanly anymore, but I can have a look if I can manually see
how to do it.