[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 #29 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Michel Dänzer from comment #27)
> Created attachment 107544 [details] [review]
> drm/radeon: Try placing NO_CPU_ACCESS BOs outside of CPU accessible VRAM
> 
> Please try current Mesa with no patches except for the two I just attached,
> plus this kernel patch together with the previous kernel patch.

With these it's better but still a bad. There are still pauses but they are a
bit shorter, the start time without intervention is still around 2min. Start
time on a good is around 1 min (assuming first run or mem caches flushed).

Hud wise - pic to follow the vram req/used match well, but the gtt is still
different from a good.

On the upside - Unigine Valley is the best I've ever seen it - way better than
what I've called as good in the past.

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