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

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Comment # 13 on bug 84662 from
(In reply to Michel Dänzer from comment #12)
> Created attachment 107391 [details] [review] [review]
> 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?

I can't go back that far with Elemental due to llvm asserts.

> 
> 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?

No, the patch makes no difference.


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