[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 #36 from José Suárez <j.suarez.agapito at gmail.com> ---
(In reply to Luzipher from comment #34)
> As todays commit 7b4276d7acf2e0f77044cb50caa6ad936fa78786, "r600g,radeonsi:
> Always use GTT again for PIPE_USAGE_STREAM buffers", refers to this bug:
> The patch helps tremendously against stuttering (~0.5s pause irregularly
> about twice a minute) in Borderlands 2. Kernel is an unmodified agd5f
> 3.18-next, hardware r9 290x.
> 
> Thanks !

That mesa patch also reduced my stutter in BL2. Right now (I have just tested 5
minutes) I only get short lags when the game must load new areas/models (e.g.
making a turn or entering new map zones). I'm on 3.17 rc7 (Radeon HD 7870).

The stutter was also very noticeable in EuroTruck Simulator 2, making the game
almost unplayable. There still a few stutters in this game, so I would say the
stutter is not completely gone (even though my BL2 experience is good).

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