[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 #8 from Eero Tamminen <eero.t.tamminen at intel.com> ---
On BXT, drop is clearly visible (3%) in a daily trend of median for 3 runs,
which is in middle of large number of other runs (i.e. definitely TDP limited). 

I can try reproducing it manually.

This is the case where it's most visible on J4205 BXT under X / Ubuntu 18.04 /
Unity (and X & Mesa git within few months):
* bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan
* bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan_off

This is the only case where it's visible on KBL GT3e:
* bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan31
* bin/testfw_app --gfx glfw --gl_api desktop_core --width 1920 --height 1080
--fullscreen 1 --test_id gl_manhattan31_off

Note that both devices have FullHD monitor (i.e. compositor will skip
compositing for 1920x1080 fullscreen windows), dual-channel memory [1].  Your
results can differ significantly with IGP if you use just single memory
channel, as GPU operations can then be much more memory bandwidth bound.

KBL GT3e drop is much smaller, but there's also much less variation, so it's
clearly visible in trend too.

[1] 1866Mhz for BXT, 2133Mhz for KBL.  BXT J4205 BIOS is AMI P1.40 (AsRock
motherboard), KBL is BNKBL357.86A.0062.2018.0222.1644.

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