4G内存时linux的mtrr表不正确的解决mt显示内存不足

这个会导致nvidia的驱动不能加速2d，解决方案一般就是重写mtrr表。

echodisable=2″>|/proc/mtrr
echodisable=1″>|/proc/mtrr
echodisable=3″>|/proc/mtrr
echodisable=4″>|/proc/mtrr
echodisable=0″>|/proc/mtrr
echobase=0×00000000size=0×80000000type=write-back>|/proc/mtrr
echobase=0×80000000size=0×40000000type=write-back>|/proc/mtrr
echobase=0xC0000000size=0×10000000type=write-back>|/proc/mtrr
echobase=0×100000000size=0×20000000type=write-back>|/proc/mtrr
echobase=0×120000000size=0×10000000type=write-back>|/proc/mtrr