https://bugs.freedesktop.org/show_bug.cgi?id=82050
--- Comment #62 from Andy Furniss adf.lists@gmail.com --- (In reply to comment #61)
Note that some of the Unreal Engine 4 demos want to use more than 1G of graphics memory (as shown by the GALLIUM_HUD queries requested-VRAM and requested-GTT), so if the GPU has 'only' 1G of VRAM or less, that's a very difficult situation for the graphics memory management code.
I do have 2 gig, but looking at the screenshot of elemantal to be attached I see that used and requested differ.
This shot doesn't really show how long the pauses are - they are really bad, it takes about 2 minutes to render the first few frames with pauses of many seconds after that.
It's so bad it's hard to tell whether the revert helps - probably not, I guess it's something different. Have you tried Elemental?