[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 #14 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Michel Dänzer from comment #12)
> Created attachment 107391 [details] [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?
> 
> 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?

More testing - incomplete but will post initial findings as I don't know when
I'll finish.

I managed to get older mesa to build with new llvm by applying the build fixes.

With mesa on the commit before
r600g,radeonsi: Set RADEON_GEM_NO_CPU_ACCESS flag for tiled BOs
(I don't know yet exactly what mesa commit changed things)

I can with your patch or the stream revert get "good" behavior, this was with a
kernel on the "bad" HPD kernel commit.

Will test more over time.

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