[Intel-gfx] less load less performance

[Alexey Fisher]

Hallo all,

after testing latest intel_drm_next v2.6.36-07547-g100519e on my netbook
i have seen interesting issue. Standardly started glxgears performs not
so well, it drops some times to 25fps.
if start glxgears in fullscrean mode it performs well - about 60fps.

here is powertop --dump, glxgears in standart window:
====================================================
C0 (Prozessor läuft) ( 6,7%)
zyklisches AbfraC1 mwait 0,0ms ( 0,0%)
C1 mwait 0,4ms ( 0,2%)
C2 mwait 2,0ms ( 6,1%)
C4 mwait 5,6ms (87,0%)
P-States (Frequenzen)
1,67 GHz 13,4%
1333 MHz 0,1%
1000 MHz 86,4%

dump with glxgears in fullscrean mode.
====================================================
C0 (Prozessor läuft) (18,5%)
zyklisches AbfraC1 mwait 0,0ms ( 0,0%)
C1 mwait 0,4ms ( 0,4%)
C2 mwait 2,2ms (29,0%)
C4 mwait 1,8ms (52,2%)
P-States (Frequenzen)
1,67 GHz 11,7%
1333 MHz 0,1%
1000 MHz 88,2%

As i can understand if cpu do not get enough load it will work mostly in
C4 mode and graphic perfome slow too. I think there is some thing wrong
in this logic :)
-- 
Regards,
        Alexey