[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 #49 from wendy.wang at intel.com ---
Update more:
When this issue open the FPS drop % as below:
Lightsmark v2008 perf dropped by 16% vs. good commit
CS game perf dropped by 36% vs. good commit
Half life2 perf dropped by 45% vs. good commit
Portal game perf dropped by 28% vs. good commit

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

Lightsmark v2008 perf dropped by 2% vs. good commit
CS game perf dropped by 12% vs. good commit
Half life2 perf dropped by 13% vs. good commit
Portal game perf dropped by 11% vs. good commit

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