[Bug 65396] New: [HSW ULT/IVB]FBC poor management when running video workload

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65396

          Priority: medium
            Bug ID: 65396
                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/IVB]FBC 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\IVB

Libdrm:                       (master)libdrm-2.4.45-3-

g3586337f3703ce4833a375f66b08df064a1cec28
Mesa:                          (master)f6beb4c6b647b0d5077c7abd6c99cdaba6e0c112
Xserver:                      (master)xorg-server-1.14.99.1-82-

g7e97166c4fc38076b6224e4dbdd632b43444149f
Xf86_video_intel:        
(master)2.21.6-47-gd6c30d1d4df6bcdfa075bd29da7c8aabee20774c
Cairo:                         (master)631bf299256e11a17511977f357e0353fb5615f7
Libva:                         
(staging)880c916092c6d68096c95e49405714d8a21f9322
Libva_intel_driver:        (staging)0a5cfdab47c788569feb0a3e4293906687523f88    
Kernel:                        (drm-intel-nightly)
675fa342aa3a54af0a81f23809fff9590dfb6fc1


Test result:
----------------------------------------      
HSW-ult      FBC disable Average_watt       FBC enable Average_watt          
idle         14.8                           14.7 
browser      17.9                           17.8
video        18.7                           18.6
game         21                             21

IVB          FBC disable Average_watt       FBC enable Average_watt
idle         28                             27.8      
browser      32.5                           32.1
video        31.6                           32
game         34.8                           34.7     


Findings:
----------------------------------------
on HSW, FBC saved 0.1w running idle/browser/video workloads, but did not save
any power when running game workload.
on IVB, FBC saved 0.2w on idle, 0.4w on browser, 0.1w on game, but FBC cost
more 0.4w power when running video workload.

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