[Bug 65395] New: [HSW ULT]rc6 poor management when running video workload

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65395

          Priority: medium
            Bug ID: 65395
                CC: gordon.jin at intel.com, lianyuex.yang at intel.com,
                    ouping.zhang at intel.com, tienan.liu at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW ULT]rc6 poor management when running video
                    workload
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: tienan.liu at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
----------------------------------------
Platform: HSW-ult
Libdrm:            
(master)libdrm-2.4.45-3-g3586337f3703ce4833a375f66b08df064a1cec28
Mesa:                (9.1)cbe0e50247c909a7d34f71d9a1a4852b6c3af472
Xserver:             (master)7e97166c4fc38076b6224e4dbdd632b43444149f
Xf86_video_intel:  (master)2.21.6-47-gd6c30d1d4df6bcdfa075bd29da7c8aabee20774c
Cairo:                (master)631bf299256e11a17511977f357e0353fb5615f7
Libva:                (master)32e44bcf45ee0f4a345ccaedda1d45079e8186ed
Libva_intel_driver: (master)31caada2967b94705d78ab7f6d07965ad7f13d42
Kernel : 3.9.3


Test result:
----------------------------------------      
workloads         RC6 disable average_watt         RC6 enable average_watt
idle              18.3                             14.5
video             18.6                             18.6 
game              23.9                             22.7              


finding:
----------------------------------------
On the platform of HSW-ult, RC6 saved 3.8w when running idle, and saved 1.2w
when running game, but did not save any power on video.

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