mtrr and X windows

[jan <goplay@quick.cz>]

Hello!

I'm curious about mtrr. 

when i type

cat /proc/mtrr

i got:

reg00: base=0x00000000 (   0MB), size= 256MB: write-back, count=1
reg01: base=0xd6000000 (3424MB), size=  16MB: write-combining, count=1
reg02: base=0xd0000000 (3328MB), size=  64MB: write-combining, count=1

so. to me it looks like i have mtrr (i've compiled my kernel with mtrr)

The question I'd like to ask is: 
Do I need to enable it somehow in X windows or X does use mtrr
automatically ?

thanks

Jan