Bug 75083

Summary: [IVB/HSW bisected]3D performance (e.g. padman, smokin-guns) reduced ~10%
Product: Mesa Reporter: Guo Jinxian <jinxianx.guo>
Component: Drivers/DRI/i965Assignee: Kenneth Graunke <kenneth>
Status: VERIFIED FIXED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: major    
Priority: high CC: eero.t.tamminen, jianx.zhou, kenneth, mengmeng.meng
Version: git   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: xorg.0.log on commit d8c7740ddabeb456243e40dc3cf0e86c7fca09d0

Description Guo Jinxian 2014-02-17 09:40:03 UTC 
Created attachment 94200 [details]
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@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
Comment 1 meng 2014-02-20 02:05:18 UTC 
3D cases(ET: Quake Wars Demo, Openarena v0.8.8, urbanterror v4.1) also reduced by 
3%~6%.
Comment 2 zhoujian 2014-03-07 07:58:59 UTC 
The problem can't reproduce,so verified it.

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