[Intel-gfx] Mesa drm-gem performance regression on 915/945

[He, Shuang]

Keith Packard wrote:
> On Tue, 2008-08-05 at 10:43 -0700, Jesse Barnes wrote:
>   
>> On Tuesday, August 05, 2008 10:32 am Keith Packard wrote:
>>     
>>> Running the drm-gem branch of mesa, I'm finding performance to be quite
>>> terrible -- openarena is running at about 2fps on my 915GMS machine,
>>> where it use to top 20fps. True in both GEM and INTEL_NO_GEM=1 mode.
>>> Using drm-gem DRM and drm-gem xf86-video-intel as of this evening.
>>>       
>> I recently pushed a change to default to using vblank sync'd buffer swaps.  
>> That could be the problem if that code broke recently...
>>     
>
> gears is at 180FPS, open arena is at 2fps. Seems unlikely, but I guess
> it's possible
>
>   
We've just tried drm-gem for all components except drm module and kernel
from anholt's linux-2.6 tree.
seems it's working well on our 945G,
vblank_mode=0
glxgears 1250fps
glxgears 1112fps(classic)
openarena 113fps
openarena 80fps(classic)
vblank_mode=2
glxgears 60fps
glxgears 60fps(classic)
openarena 75 fps
openarena 71 fps(classic)

Thanks
--Shuang
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