[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 #5 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Looking at the 1-2% perf regression in Manhattan 3.1 on KBL GT3e, I'm seeing:
* Mot much change in GPU & CPU power usage, but CPU power usage did increase
and GPU decrease on KBL too
* Individual frame timings that were before change fluctuating within few tens
of percent, have now 3x differences between fastest and slowest frames [1]. 
BXT doesn't have similar change
* IOWait is now 30-60%, before it was mostly in single digits with only
occasional high IOWaits.  I'm not sure whether one can deduct anything from
this though, as one earlier run was constantly at 40-70%, with no impact on
perf

[1] I'll try to reproduce these and look into KBL frame timings a bit more. If
there's anything of interest, I'll mail data to you directly.

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