https://bugs.freedesktop.org/show_bug.cgi?id=84662
--- Comment #15 from Chernovsky Oleg adonai@xaker.ru --- Created attachment 107438 --> https://bugs.freedesktop.org/attachment.cgi?id=107438&action=edit bad gtt usage (Borderlands 2)
(In reply to smoki from comment #11)
(In reply to Chernovsky Oleg from comment #9)
I experience the same freezes (1-1.3 sec) every 10 sec in any Valve Source engine-based games.
Well open a new bug, sttuter/freezes can be of varios cause... hardware combinations, APU or dedicated card, on AMD procesor on Intel so what governor used, composite or not, vblank on or not, spilling freezes, some particular effect unoptimized, etc... so various causes could be, this one is i think only about GTT load and fps drop because of that, so if you are sure it is because of that (check with GALLIUM_HUD=fps,GTT-usage) than that is the same bug.
I know what I'm talking about. It's this bug, so I've written here.
Here's the proof (Unreal Engine 3, though, I can provide it with any Valve game at will). Spikes on the GTT usage have corresponding falls of the FPS.
Radeon R7 260X (BONAIRE)