[Bug 91788] [HSW Regression] Synmark2_v6 Multithread performance case FPS reduced by 36%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91788

            Bug ID: 91788
           Summary: [HSW Regression] Synmark2_v6 Multithread performance
                    case FPS reduced by 36%
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: wendy.wang at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

System Environment:
--------------------------
Mesa Regression: yes, but cannot bisect now

Failed Platform: HSW
Observed HSW performance FPS reduced by 36% when running Synmark2_v6
Multithread case


Bug detailed description:
-----------------------------
Compare with good commit, Synmark2_v6 Multithread case performance FPS dropped
by 36%

Currently cannot bisect, only find good and bad commit.
Good commit: 
commit 87cea61b9e2681e5365e989c7fa7a0298e4005fa    
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Mon Aug 10 15:35:21 2015 -0400

    radeonsi: add new OLAND pci id

Bad commit: 
commit ecebd3dbfcb769b44e99733279c8fb0745818708   
Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Wed Aug 19 18:43:47 2015 -0400

    glsl: expose textureQueryLod in GLSL 4.00+ fragment shaders

    See issue from the ARB_texture_query_lod spec for LOD vs Lod confusion:

        (3) The core specification uses the "Lod" spelling, not "LOD".  Should
            this extension be modified to use "Lod"?

Bisect progress log:
1,  bf3c50fba221f216e38d3f60f89161ced4c684c0  bad
2, 1bba29ed403e735ba0bf04ed8aa2e571884fcaaf  bad
3,d32c45ca7bd5a81b312504ba99cdab3d748251f7    skip
4, 3c04a90e91a64a4a09d77c76c6ddcaca949e9b0e   skip
5, bfac8ba9d32be351277c7ea814ac9848bdcb1f16    bad
6, c58534c1384dc63bb1b13eb37c06bdb4652c13ff  skip
7, c4b4bad68a90510406c0bef97039f7d0b4f8f5fe    skip
8, f72fead4a28d5d8a16bbc20781218ea7df0b9c9a  bad
9,13a04abc277089275217dce119e18acf4d4ce52d   skip
10. fb19df7a626d02cb54614d4610af2d14720a2ef3     skip
11, a47ae8de2cf30fbe45318a18a2ea032f30ab7d10    skip
12. b88f14702d9c02a34d517f95fe840527961631cd     skip
13, fe55ab2d12202236ba5bf9beae09803dfe97a7ac    skip
14, 86dbd8af40deaa99aedf011e863b908173e63012   skip
15, f9094691378722304dd94deb76ad013bd65c7a5b  skip
16, 50545882113b389decc3f05771764f6c62213af3  skip
17, 2cdb24a7c2238843d23b468275d479553f537e7e skip 
18, 7e8be000101cc6fe3846745b559f2d785430e253 skip
19, 5f1d5b1c7857f8680b47a7a450ee9e4530e22c6f     can't start gnome-session 
can't run
20, caae52561dabb2d20f2369c547e660d078974285 skip
21, e3eb91af804f449005a2ff535c805eaa1d579d99  can't start gnome-session  can't
run


Reproduce steps:
---------------------------
1.  xinit& 
2.  gnome-session&
3.  cd /usr/local/games/OpenGL/SynMark2_6/
4. ./synmark2 OglMultithread

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