[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 #12 from Michel Dänzer <michel at daenzer.net> ---
Created attachment 107391
  --> https://bugs.freedesktop.org/attachment.cgi?id=107391&action=edit
Make Mesa behave as if the kernel was older

(In reply to Andy Furniss from comment #3)
> gallium hud on bad showing different vram gtt usage

That's very interesting indeed — on the 'good' screenshot, requested and actual
VRAM usage match up almost perfectly, but on the 'bad' one, there's a large
discrepancy.

With a current kernel, does the bad behaviour start with the same Mesa commit
as the Unigine stutters?

The attached patch makes Mesa behave the same with current kernels as it does
with older ones which don't have the bisected commit. Does that avoid the
problem?

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