https://bugs.freedesktop.org/show_bug.cgi?id=82050
--- Comment #64 from Christoph Haag haagch@frickel.club --- (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 too have 2 Gigabyte VRAM. Here is a short clip with some HUD graphs: https://www.youtube.com/watch?v=vvqbAFV06pA
It's pretty clear that the stutters correlate with activity in "num bytes moved"...
I have also tried the native borderlands 2 for a few minutes today and I'm seeing similar stuttering. It doesn't happen quite so often, but it's still often enough to be an issue.