[Bug 90112] [BSW bisected] OglGSCloth/Lightsmark/CS/ Portal/ Half Life 2 games performance decreased by 15%-45%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90112

--- Comment #47 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to wendy.wang from comment #46)
> Add intel_pstate=disable parameter does not fix this bug on BSW
> test with cs game,
> (bad- parent) vs. parent commit: -33%
> 
> Bad next-queued kernel commit:
> 1854d5ca0dd7a9fc11243ff220a3e93fce2b4d3e
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Tue Apr 7 16:20:32 2015 +0100
> 
>     drm/i915: Deminish contribution of wait-boosting from clients
> 
> 
> parent next-queued kernel commit of 1854d5ca0
> commit 6ad790c0f5ac55fd13f322c23519f0d6f0721864
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Tue Apr 7 16:20:31 2015 +0100
> 
> drm/i915: Boost GPU frequency if we detect outstanding pageflips

The open question was whether the regression remains after 
commit 8d3afd7d0e666b932e6fa15901e6280fe829a786
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu May 21 21:01:47 2015 +0100

    drm/i915: Use spinlocks for checking when to waitboost

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