[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 #19 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Michel Dänzer from comment #17)
> Created attachment 107451 [details] [review]
> ttm: Don't evict BOs outside of requested placement range
> 
> Does this kernel patch help?

agd5f drm-next-3.18-wip + patch is still bad.

Bad can be a bit variable, but I would call it as one of the better bads and
the vram usage is closer to a good - pic to follow.

Another observation - On good or bad the demo takes a while to get going.

Time to start of normal rendering on this patched kernel is around 2m5s

If I wiggle the window around while it's loading/stuck = 1m23s

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