[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 #54 from Andy Furniss <adf.lists at gmail.com> ---
Created attachment 111966
  --> https://bugs.freedesktop.org/attachment.cgi?id=111966&action=edit
elemental stalls near end with large vram -> gtt move

Generally the new version is a bit better, it's still not right, it has
glitches but they are shorter.

I have 8 Gig ram now so can run from tmpfs to exclude the glitching being
caused by disk activity. 

There is sometimes a new issue very near the end where there is a chance of a
multi second stall corresponding to vram -> gtt move as in the screenshot.

This didn't happen at all the first couple of times I tested.

The third time only 200meg was moved the fourth is this shot.

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