The cpu speed command measures each processor speed using a chip set high precision timer clock. Measurement takes approximately five seconds.
udiag cpu speed
ONE_AP_OR_BSP; ONE_INSTANCE_ONLY
To measure the speed of the boot strap processor (BSP), type:
fs0:/> udiag cpu speed
To measure the speed of an application processor (AP). For example, to test AP 3, type:
fs0:/> udiag cpu speed -ap 3