[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 #44 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Michel Dänzer from comment #42)
> (In reply to Andy Furniss from comment #40)
> > It's still not right for me and never has been.
> 
> Define 'right'. What's the target we're aiming for here?

It's still stuttery, but it could be my 4G mem/the way the game loads.

If I run from clean most of the stutters/long start time correspond with
"vmstat 1" showing disk activity. It seems having 4 gig (swap is off to avoid
extra disk use) it seems I don't have enough ram to disk cache the whole demo.
If I stop it after a while I can get the first bit cached (ie. I can run it
without vmstat 1 showing anything), but it's still stuttery in the places where
it would be loading from disk were it first run.

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