[Bug 90112] New: [BSW bisected] lightsmark performance decrease

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90112

            Bug ID: 90112
           Summary: [BSW bisected] lightsmark performance decrease
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115206
  --> https://bugs.freedesktop.org/attachment.cgi?id=115206&action=edit
dmesg

System Environment:
--------------------------
Regression: yes

Platform: BSW
kernel: drm-intel-nightly: 5ea91de4ff45adb60031853d64314c3405378fbd(2015-04-15)

Bisect result 

1854d5ca0dd7a9fc11243ff220a3e93fce2b4d3e is the first bad commit commit
1854d5ca0dd7a9fc11243ff220a3e93fce2b4d3e
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Apr 7 16:20:32 2015 +0100

    drm/i915: Deminish contribution of wait-boosting from clients

    With boosting for missed pageflips, we have a much stronger indication
    of when we need to (temporarily) boost GPU frequency to ensure smooth
    delivery of frames. So now only allow each client to perform one RPS boost
    in each period of GPU activity due to stalling on results.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Deepak S <deepak.s at linux.intel.com>
    Reviewed-by: Deepak S <deepak.s at linux.intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 1712eed4c716325d29cf054c64636c06a8e5fb14
ff5070b8d3d083464faa37a4712e2a9b3084fb24 M drivers 


Bug detailed description:
-----------------------------

lightsmark performance decreased by about 15-20%.


Reproduce steps:
---------------------------

run lightsmark case and check the performance difference.

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