[Bug 90134] New: [BSW Bisected]GFXBench3_gl_driver/GFXBench3_gl_driver_offscreen performance reduced by 11%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90134

            Bug ID: 90134
           Summary: [BSW
                    Bisected]GFXBench3_gl_driver/GFXBench3_gl_driver_offsc
                    reen performance reduced by 11%
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115257
  --> https://bugs.freedesktop.org/attachment.cgi?id=115257&action=edit
dmesg file

System Environment: 
Failed platform: BSW

GFX SW stack:
 Libdrm:       
(master)libdrm-2.4.60-34-g0d78b37b1cac304ce5e84d1207f0a43abd29c000
 Mesa:        (master)1eac3ae1a6ebecf353054d937dd603a11ea33fb3
 Xserver:       
(master)xorg-server-1.17.0-76-gb1029716e41e252f149b82124a149da180607c96
 Xf86_video_intel:       
(master)2.99.917-274-g75d87762471e195dddd73056fc6a06e17db1c8b0
 Cairo:        (master)2cf2d8e340a325adb205baf8e4bd64e1d1858008
 Libva:        (master)062a63932c0f1439aa587aa986bbcfb758ff38f2
 Libva_intel_driver:        (master)890f538f62707ec07a6accdb65bafcaffc941bb1
 Kernel:   (drm-intel-nightly)d600654ab94b325f253e267422dcf60302120ea0


Regression: Yes, it's kernel regression
Bisect from drm-intel-next-queued branch, the first bad commit shows as below:

commit f4f71c7dfc5c989f53a1861f3ac42e24018fad4c
Author: Deepak S <deepak.s at linux.intel.com>
AuthorDate: Sat Mar 28 15:23:35 2015 +0530
Commit: Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Thu Apr 16 16:05:24 2015 +0200

    drm/i915: Re-adjusting rc6 promotional timer for chv


Bug description:
GFXBench3_gl_driver/GFXBench3_gl_driver_offscreen performance reduced by 11% 

Reproduce Steps:
1. cd /gfxbench3_desktop/build/linux/gfxbench_Release/mainapp
2. export
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/games/OpenGL/gfxbench3_desktop/install/linux/lib
3. ./mainapp vblank_mode=0 -t gl_alu -fullscreen 1 -w 1920 -h 1080

Dmesg file has been attached.

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