[Bug 103258] [GEN9+] Misrendering and 5% performance drop in GfxBench Manhattan 3.0 & CarChase

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103258

            Bug ID: 103258
           Summary: [GEN9+] Misrendering and 5% performance drop in
                    GfxBench Manhattan 3.0 & CarChase
           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
                CC: martin.peres at free.fr

Created attachment 134830
  --> https://bugs.freedesktop.org/attachment.cgi?id=134830&action=edit
Example of Manhattan 3.0 misrendering

Between following Mesa commits:
e676434856 2017-10-10 17:45:22 UTC Implement a new GL_MESA_tile_raster_order
extension
3c66a461f3 2017-10-11 17:45:31 UTC meson: fix glx test

Manhattan 3.0 rendering has broken, there are now two transparent horizontal
bands on top of the screen bottom.  See the attachment.

Additionally there was (values are from KLB GT3e):
* 5-6% perf drop in CarChase
* 4% perf drop in Manhattan 3.1

These regressions happen on all GEN9+ platforms.

Martin's bisecting this, I'll add the exact commit once the bisecting finishes.


(Additionally, with Mesa Git tip, I'm also getting GfxBench NULL pointer
segfault/aborts when testfw_app starts, at least on SKL GT2.)

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