[Bug 111090] 3% perf drop in GfxBench Manhattan 3.0, 3.1 and CarChase test-cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111090

--- Comment #12 from Eero Tamminen <eero.t.tamminen at intel.com> ---
When going through all the benchmarks data, I noticed that GLBenchmark 2.7
windowed *onscreen* Egypt and T-Rex also regress on J4205 BXT in the same time
interval:
$ build_x86_64/binaries/GLBenchmark -skip_load_frames -data data -t
GLB27_EgyptHD_inherited_C24Z16_FixedTime -w 1366 -h 768 -ow 1366 -oh 768
$ build_x86_64/binaries/GLBenchmark -skip_load_frames -data data -t
GLB27_TRex_C24Z16_FixedTimeStep_Offscreen -w 1366 -h 768 -ow 1366 -oh 768

Regression is 4-6%, but one sees it clearly only from trend because GLB tests
have a lot of variance (due to being also slightly CPU bound, and their FPS is
reported as integers).

This regression isn't visible on the other machines (BDW GT2, SKL GT2, KBL
GT3e).

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