[Bug 89402] New: [HSW mobile bisected]Unigine-heaven performance reduce by 12% with gnome-session

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89402

            Bug ID: 89402
           Summary: [HSW mobile bisected]Unigine-heaven performance reduce
                    by 12% with gnome-session
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: yex.tian at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: mattst88 at gmail.com

System Environment:       
Platform:  HSW mobile
Kernel: 3.19.0-rc7+
Libdrm: (master)libdrm-2.4.59-20-g7cb1d6e2d6c63e3bc4b275ff073152b550ba5b0f
Mesa:   (master)599cbe5508ccb246fe06b64116c84ce976165fed
Xserver:(master)xorg-server-1.17.0-16-g3a06faf3fcdb7451125a46181f9152e8e59e9770
Xf86_video_intel:(master)2.99.917-145-g127aae5a72a69df325fed0b63d345e81583d5ca1

Bug detailed description:
--------------------------------------------------
Unigine-heaven performance reduce by 12% with gnome-session on HSW mobile,
reduce by 6.5% on HSW desktop.
It’s Mesa regression. By bisected, show that 2dad1e3a is the first bad commit.

commit 2dad1e3abdb1ad153289455f3e273101e5bac1a8
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Wed Feb 12 11:00:46 2014 -0800
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Tue Feb 17 20:44:09 2015 -0800

    i965/fs: Add pass to combine immediates.

    total instructions in shared programs: 5885407 -> 5940958 (0.94%)
    instructions in affected programs:     3617311 -> 3672862 (1.54%)
    helped:                                3
    HURT:                                  23556
    GAINED:                                31
    LOST:                                  165

    ... but will allow us to always emit MAD instructions.

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

Please see Xrog.0.log.

Reproduce steps:
----------------------------
1, xinit& 
2, gnome-session&
3, vblank_mode=0 ./bin/heaven_x64 -video_app opengl -data_path ../ -sound_app
null -engine_config ../data/heaven_4.0.cfg -system_script heaven/unigine.cpp
-video_mode -1 -video_fullscreen 1 -extern_define PHORONIX,RELEASE -video_width
1920 -video_height 1080

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