dri on radeon7500, few of fps

[Виталий Каверин]

Hi
I'm using Freebsd 5.1 and Radeon 7500 on my desktop 
machine. Some problem is dri does not working correctly(a 
few of fps). DRI started normally. In my kernel.config are 
active next options: device radeondrm, device vesa. But 
glxgears show me only 950 fps. 
fragment XF86Config:
Driver "radeon"
option "AGPMode" "4"
option "AGPFastWrite" "on"
option "AGPSize" "64"

fragment of glxinfo:
Direct rendering: Yes

DRI is working but i want to give more fps... How to fix 
this problem??
Excuse for bad English...