[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 #14 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Between following drm-tip kernel commits:
8bb86058e9 at 2019-08-09 15:06:19: 2019y-08m-09d-15h-05m-28s UTC integration
manifest
cfacb6e14c at 2019-08-10 14:01:32: 2019y-08m-10d-14h-00m-41s UTC integration
manifest

There were following perf changes on SKL GT2 & KBL GT3e:
* SynMark VSTangent improved by 10%
* GLB 2.7 Egypt improved by 1-2%
* GLB 2.7 T-Rex improved by < 1%
* SynMark ZBuffer decreased by 5% KBL GT3e and 3% on SKL GT2 (*)

(SynMark is FullHD fullscreen, GLB is 1/2 screen windowed.)

Neither BDW GT2 nor BXT perf changed.  For other things I don't have data.

(GfxBench Manhattan tests perf has improved on BXT sometime since mid-July, but
I don't have data on whether it's due to kernel or Mesa.)


(*) ZBuffer text draws a lot of trivial triangles on top of each other, so it
tests depth read/write and render write bandwidth + draw overhead.

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