[Bug 84662] Long pauses with Unreal demo Elemental on R9270X since : Always flush the HDP cache before submitting a CS to the GPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84662

--- Comment #15 from Chernovsky Oleg <adonai at 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)

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