[Bug 92562] [IVB/BYT/BDW/BSW Regression]Synmark2_v6 OglBatch7 performance reduced by 6%-10%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92562

            Bug ID: 92562
           Summary: [IVB/BYT/BDW/BSW Regression]Synmark2_v6 OglBatch7
                    performance reduced by 6%-10%
           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

Created attachment 119025
  --> https://bugs.freedesktop.org/attachment.cgi?id=119025&action=edit
xorg.log

Test environment:
IVB/BYT/BDW/BSW platforms will have this regression issue.
Mesa regression: Yes.Bisect is in under going.

Description:
Synmark2_v6 OglBatch7 performance reduced by 6%-10% for below platforms.
IVB-M: dropped by -6%
BYT-M: dropped by -7%
BDW-U: dropped by -9%
BSW-M: dropped by -17%

Xorg.log attached.

Mesa Good commit:
git-82b324c

Mesa Bad commit:
git-ff31c24

Reproduce steps:
1.   xinit&
2.  ./synmark2 OglBatch7

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