[Bug 80792] New: [IVB/HSW/BYT-M Bisected]3D ( SynMark2_v5.3.0 /SynMark2_v6.0 /Lightsmarkv2008 &/warsow_v1.0 /GLBenchmarkv2.7.0) performance reduced 20%~70%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80792

          Priority: medium
            Bug ID: 80792
          Assignee: idr at freedesktop.org
           Summary: [IVB/HSW/BYT-M Bisected]3D ( SynMark2_v5.3.0
                    /SynMark2_v6.0 /Lightsmarkv2008 &/warsow_v1.0
                    /GLBenchmarkv2.7.0) performance reduced 20%~70%
        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: IVB/HSW/BYT-M
Libdrm:(master)libdrm-2.4.54-17-ge8c3c1358ecaf4e90f7d43762357
Mesa:(master)1bfc0a11027449ae7ab7c28eb695f26de530eccf
Xserver:(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e0386364
Xf86_video_intel: (master)2.99.912-200-ge6e5330857097eb2caafa89d571d12e
Cairo: (master)550385fb004e6064305518cf265adc03bd2d0c0b
Libva: (master)c61d8c6ce9ffc27320e9e177c1e1123d5f1b5014
Libva_intel_driver:(master)c5cb17ea86f0065a939d3636dd26651c93d497c8
Kernel:(drm-intel-nightly) git-a7665f

Bug detailed description:
----------------------------------------------
3D ( SynMark2_v5.3.0 /SynMark2_v6.0 /Lightsmarkv2008 &/warsow_v1.0
/GLBenchmarkv2.7.0) performance reduced 20%~70% on IVB/BYT-M/HSW,It works well
on BDW. 
The problem exists both on gnome-session and Raw X.

It’s Mesa regression.By bisected show first bad commit is:
3178d2474ae5bdd1102fb3d76a60d1d63c961ff5
Author:     Iago Toral Quiroga <itoral at igalia.com>
AuthorDate: Tue Jun 17 13:45:18 2014 +0200
Commit:     Iago Toral Quiroga <itoral at igalia.com>
CommitDate: Mon Jun 30 08:08:50 2014 +0200
    i965: Implement GL_PRIMITIVES_GENERATED with non-zero streams.

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

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