[Bug 106708] [SKL/KBL/GLK] 2-3% performance drop in SynMark DrvState and 5-9% drop on SynMark Multithread

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106708

            Bug ID: 106708
           Summary: [SKL/KBL/GLK] 2-3% performance drop in SynMark
                    DrvState and 5-9% drop on SynMark Multithread
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Mesa performance with SynMark v7 DrvState performance dropped by 2-3% between
following Mesa commits:
2018-05-21 11:57:46 73df16dcee: radv: fix centroid interpolation
2018-05-22 17:02:28 92f01fc5f9: i965: Emit VF cache invalidates for 48-bit
addressing bugs with softpin.

This performance drop is clearly visible on SKL GT2, GT3e, GT4e, KBL GT2, GT3e
and GKL B0.  On BXT devices there's too much variance in this test to be sure
whether they're affected.

In the same interval there's even larger drop in SynMark v7 Multithread test on
the same machines.  That drop isn't visible on BXT.

These regressions are GEN9+ specific, they aren't visible on GEN6-8 machines.


Only commits in that range which could have impact on these machines are:
92f01fc5f9 i965: Emit VF cache invalidates for 48-bit addressing bugs with
softpin.
c7259259d4 i965: Introduce a "memory zone" concept on BO allocation.
417b9e5770 intel/eu: Set EXECUTE_1 when setting the rounding mode in cr0
fe2edb25dd dri3: Stricter SBC wraparound handling

First one affects GEN8+, next two are more generic ones, and last one is X hang
fix.  None of them is GEN9+ specific, so somebody would need to bisect these
two regressions further.

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