[Bug 65396] [IVB] FBC increases power for libva video workload

[bugzilla-daemon at freedesktop.org]

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

--- Comment #16 from ZhaoShengyan <shengyanx.zhao at intel.com> ---
(In reply to comment #11)
> Here's my latest FBC work:
git://gitorious.org/vsyrjala/linux.git
> fbc_stolen_fixes

Would be nice to know if that helps more/less than the
> previous attempt.

Ville Syrjala, we attempt the kernel that your provided and got the following
details:

Testing Env:
------------------------------
Arch:           x86_64
Platform:       HSW/IVB
OSD:            Fedora release 16 (Verne)
Kernel_version:         53eb94ae76ca4a19d09fad378a8453cfa8430bb5
Libdrm:         (master)libdrm-2.4.50
Mesa:           (master)0b16042377a6981ff9bba92387889524a3547b3f
Xf86_video_intel:              
(master)2.99.906-86-gade25f4f95994b565a8ed8eb3811ff7453a8b0e5
Cairo:          (master)8e11a42e3e9b679dce97ac45cd8b47322536a253
Libva:          (staging)a3097a5b045f4d624ae50949c891351e08588d66
Libva_intel_driver:            
(staging)2a61b0d17072bdc5b58608e3dfa2c4f9f80dcec4
Ffmpeg:         (master)8e5a2989a387e809d7367167114d2f2a45649ffa
Mplayer:                (hwaccel-vaapi)1923fa10ed77bbf8408f2ce312d85a97dab1f0f3
Glib:           (master)a22f77739dd4ec911d7bdc0f0fc61314e5f9f1cf

Test result:
----------------------------------------      
HSW-ult      FBC disable Average_watt       FBC enable Average_watt          
idle         10.7                           10.7 
browser      16.2                           16.2
video        16.9                           16.8
game         25.1                           24.9

IVB          FBC disable Average_watt       FBC enable Average_watt
idle         29.2                           29.0      
browser      30.0                           29.7
video        36.7                           36.6
game         39.3                           39.3     

Findings:
----------------------------------------
1. Got much better result than the former testing via this new commit. At
least, enable fbc feature were not cost more power.
2. It is still not save power, at least not obvious, when fbc enabling in
testcase idle/browser at HSW, and game at IVB.

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