SPARC: UltraSPARC T2 PCI Express Interface Unit Performance Counter Data

UltraSPARC T2 systems PCI Express Interface Units (PIU) have built-in performance counters which can be dumped by using busstat. The output of the busstat -l command shows the following devices for such systems:

• imu#

• mmu#

• peu#

• bterr#

where # is an instance number.

The use of this built-in performance counter is intended mainly for Sun field service personnel.