[Bug 69870] New: [HSW mobile GT3e Bisected] GLbenchmark v2.7.0 EgyptHD _FixedTime performance reduced by 20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69870

          Priority: medium
            Bug ID: 69870
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW mobile GT3e Bisected] GLbenchmark v2.7.0 EgyptHD
                    _FixedTime performance reduced by 20%
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mengmeng.meng at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:       
----------------------------------------------
Platform: HSW mobile GT3e i7-4950HQ 
Libdrm:     (master)libdrm-2.4.46-42-gbf4a7cd4b2456d4dc93a86bbcc51eba4ae73390a
Mesa:     (master)fe2528c0b69d5719b15d926ada9424cac7569b9c
Xserver: (master)xorg-server-1.14.99.1-215-g7d3d4ae55dd6ee338439e2424a
Xf86_video_intel:(master)2.99.902-54-gd7eb40efa79dd9ea720606b94a20179c7dd18e03
Cairo:     (master)337ab1f8d9e29086bfb4001508b28835b41c6390
Libva:     (staging)f5c913765e6af38d835cacf339054ccc60bddefb
Libva_intel_driver:(staging)f6685c309d94fb7679c9772703c8790cb71cdd73
Kernel:    (drm-intel-nightly) 24c8329416b54b79655afe45370cf3d46f41e283

Bug detailed description:
----------------------------------------------
GLbenchmark v2.7.0 EgyptHD _FixedTime performance reduced by 20% on HSW mobile
GT3e(i7-4950HQ).
The problem doesn’t exist on HSW desktop and another HSW mobile i7-4700MQ .
It’s kernel –dinq regression, bisecting show that the first bad commit is:
commit 0d8ff15e9a15f2b393e53337a107b7a1e5919b6d
Author: Ben Widawsky <benjamin.widawsky at intel.com>
Date:   Thu Jul 4 11:02:03 2013 -0700

    drm/i915/hsw: Set correct Haswell PTE encodings.

Performance
--------------------------------------------------------------------
Test GLbenchmark v2.7.0 EgyptHD _FixedTime on Raw X
drm-intel-next-queued   git-50b44a4    git-00d8ff15
                         183.67 fps     148.67 fps

Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0 ./GLBenchmark -data ../../data/  -w 1920 -h 1080 -t 2701100

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