[GEM-dev] performance question with linux and nvidia

[cyrille henry]

hello,

i've got performance question regarding Gem an openGL.

i made a test using an OS on a custom liveUSB, so that i can have the same software environment on 3 different computers:
ubuntu 10.04, NVIDIA driver v270, pd vanilla 42.5, and Gem svn.

this computer are:

very old laptop:
intel core 2 / GeforceGo 7700M

old laptop:
intel core 2 duo / Geforce 9650M gt

new laptop:
intel core i7 / Geforce GT 425M

i made a test with glsl performance, and everything is normal : a newer computer is many time faster than the older.


BUT, using a very simple patch (like attached), drawing only many time the same square, i can't see any really significant performance difference.

how could that be? what can be the botleneck?
(with "lighting 0", i can draw about 400  square before the fps goes down)



but i've got a bigger problem :
with "lighting 1", the 2 old laptop can draw about 10% less square (than with lighting 0). but the new one can draw only 3 times less square.
So the new laptop is lot's slower than the old one when light is on.

does anyone already experience something like this?
any idea why, and how to solve this?

thanks
Cyrille
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