[Bug 87725] New: [BDW Bisected] OglBatch7 performance reduced by ~7% after enable execlists

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87725

            Bug ID: 87725
           Summary: [BDW Bisected] OglBatch7 performance reduced by ~7%
                    after enable execlists
           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 111341
  --> https://bugs.freedesktop.org/attachment.cgi?id=111341&action=edit
dmesg file

Environment:
-----------------------------------
Platform: BDW

Libdrm:                        
(master)libdrm-2.4.58-19-gf99522e678dbbaffeca9462a8edcbe900574dc12
Mesa:                          
(master)ff9653775962ab661c4891721b1b93d077d1f2db
Xserver:                      
(master)xorg-server-1.16.99.901-85-g91651e7c15892aa846fc406fbb13b37f094dd3f0
Xf86_video_intel:                       
(master)2.99.916-172-g04a09d353fc5ad8a55eb2457dc8bb43638ba879e
Cairo:                           
(master)4a225fca5f121c31ddaa0af80a13bf95a7f21a5b
Libva:                           
(master)cdfd3d50d80c092ca3ae8914418be628d5a80832
Libva_intel_driver:                     
(master)f2a34f94c57e1f7ce975b2068fb087df84b92e3a
Kernel:   (drm-intel-nightly)a243fbbcfd348ec042b100f3ce02f215252d177d


Bug detailed description:
---------------------------------------------
OglBatch7 performance reduced by ~7% after enable execlists

Bisect drm-intel-next-queued kernel branch, the first bad commit is:

27401d126b5b1c8dd4df98bbb60b09ff2b3d5e60
Author: Thomas Daniel <thomas.daniel at intel.com>
Date:   Thu Dec 11 12:48:35 2014 +0000

    drm/i915/bdw: Enable execlists by default where supported

    Execlist support in the i915 driver is now considered good enough for the
    feature to be enabled by default on Gen8 and later and routinely tested.
    Adjusted i915 parameters structure initialization to reflect this and
updated
    the comment in intel_sanitize_enable_execlists().

    There's still work to do before we can let the wider massive onto it,
    but there's still time left before the 3.20 cutoff.

    v2: Update the MODULE_PARM_DESC too.

    Issue: VIZ-2020
    Signed-off-by: Thomas Daniel <thomas.daniel at intel.com>
    [danvet: Add note that there's still some work left to do.]
    Signed-off-by: Daniel Vetter daniel.vetter at ffwll.ch


Reproduce steps:
---------------------------------------------
1,   xinit &    
2,   cd /usr/local/games/OpenGL/SynMark2_6
3.   ./synmark2 OglBatch7

Dmesg file have been attached.

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