[Bug 71523] New: [IVB/HSW/BYT-M bisected] lightsmark v2008 performance reduced ~30%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71523

          Priority: medium
            Bug ID: 71523
          Assignee: idr at freedesktop.org
           Summary: [IVB/HSW/BYT-M bisected] lightsmark v2008 performance
                    reduced ~30%
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: All
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:       
----------------------------------------------
Platform: HSW/BYT/IVB
Libdrm:(master)2.4.47-11-gda738d1ed0a0941a0c
Mesa:(master) git-a594cec
Xf86_video_intel:(master)2.99.905-102-g922a8bab89c1a59
Cairo:(master)56a195a76554abe1d5567c733ba679058fe01303
Kernel:(drm-intel-nightly) 164a4cb4c1431a0

Bug detailed description:
----------------------------------------------
lightsmark v2008 performance reduced ~30%. The problem exists on both
gnome-session and Raw X.
It’s Mesa regression, bisecting show that the first bad commit is:

59b01ca252bd6706f08cd80a864819d71dfe741c
Author: Fredrik H枚glund <fredrik at kde.org>
Date:   Tue Apr 9 20:54:25 2013 +0200
    mesa: Add ARB_vertex_attrib_binding
    update_array() and update_array_format() are changed to update the new
attrib and binding states, and the client arrays become derived state.

    Reviewed-by: Eric Anholt eric at anholt.net

Performance
--------------------------------------------------------------------
Test lightsmark on ULT with Raw X
git-a594cec: 49.40
git-c6a3fb6: 75.68

Reproduce steps:
---------------------------------------------
1, xinit&
2. vblank_mode=0 ./backend silent 1920x1080

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/intel-3d-bugs/attachments/20131112/c80accb9/attachment.html>