[Bug 80705] New: [IVB/HSW/BYT-M/BDW] GpuTest_v0.5_triangle is slower by 10%~50% in fullscreen than in windowed & composited mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80705

          Priority: medium
            Bug ID: 80705
          Assignee: idr at freedesktop.org
           Summary: [IVB/HSW/BYT-M/BDW] GpuTest_v0.5_triangle is slower by
                    10%~50% in fullscreen than in windowed & composited
                    mode
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

Platform: BYT-M/IVB/HSW/BDW
Libdrm: (master)libdrm-2.4.54-17-ge8c3c1358ecaf4e90f7d43762357ae6f8e2022b6
Mesa: (master)c58486516f2ec8341f92554e28fd84c10d835a45
Xserver:
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:
(master)2.99.912-164-gc5c7dd24a55f04322d5eec10dc4352d8a8e92b1e
Cairo: (master)f574fec8d2d1f83525fd7e4dbb266b6e5091627d
Libva: (master)c61d8c6ce9ffc27320e9e177c1e1123d5f1b5014
Libva_intel_driver: (master)745340dd013399f64507de73401ab3adb712dad5
Kernel:    (drm-intel-nightly) git-1087d4

Bug detailed description:
----------------------------------------------
GpuTest_v0.5_triangle is slower by 10%~50% in fullscreen than in windowed &
composited mode on BYT-M/IVB/HSW/BDW, The problem exists both on gnome-session
and Raw X.

Reproduce steps:
---------------------------------------------
1.   xinit&
2.   ./GpuTest /test=triangle /width=1920 /height=1080 /fullscreen /benchmark
/no_scorebox

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