[Mesa-dev] [Bug 75083] New: [IVB/HSW bisected]padman and Smokin-Guns performance reduced ~10%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75083

          Priority: medium
            Bug ID: 75083
          Assignee: mesa-dev at lists.freedesktop.org
           Summary: [IVB/HSW bisected]padman and Smokin-Guns performance
                    reduced ~10%
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Other
           Product: Mesa

Created attachment 94200
  --> https://bugs.freedesktop.org/attachment.cgi?id=94200&action=edit
xorg.0.log on commit d8c7740ddabeb456243e40dc3cf0e86c7fca09d0

------------------------------------------------
Platform: IVB/HSW
Mesa: (10.1)git-62a3588
Xserver: xorg-server-1.14.5
Xf86_video_intel: (master)2.99.910-3 git-5142d1c
Cairo: (master)git-4144307
Kernel:    (drm-intel-nightly) efb4a6a66f8de821515c8a2a5571d9ebc251dbd5

Bug detailed description:
----------------------------------------------
Padman and Smokin-Guns performance reduced ~10% on IVB/HSW. The problem exists
on both Raw X and gnome-session. Please see the Xorg.0.log.
The bug exist on Mesa 10.1 and master branch,not on Mesa 10.0 branch.

It’s a Mesa regression, bisecting show that the first bad commit is:
d8c7740ddabeb456243e40dc3cf0e86c7fca09d0
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Wed Jan 15 10:08:38 2014 -0800
    i965: Support 32 texture image units on Haswell+.

Performance
--------------------------------------------------------------------
                          git- 5a51a26  git- d8c7740
padman                    263.33           239.1
Smokin-Guns                189.97           175.1

Reproduce steps:
---------------------------------------------
1, xinit&
2, vblank_mode=0 ./smokinguns.x86_64 +set r_fullscreen 1 +timedemo 1 +set
demodone "quit" +set demoloop1 "demo pts; set nextdemo vstr demodone" +vstr
demoloop1 +set r_customwidth 1920 +set r_customheight 1080

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