Which level of information does the mpstat command provide when run inside an LPAR?

Simultaneous multi-threading (SMT) profile settings are a firmware/LPAR configuration attribute viewable from the HMC or via smtctl, not reported as utilization statistics by mpstat.

Overall managed system logical processor utilization spans all LPARs and is visible only from the HMC or tools like topas -C at the CEC level, not from mpstat running inside a single LPAR.

The mpstat command in AIX displays per-processor statistics including user, system, wait, and idle percentages for each logical processor visible to the operating system instance. Inside an LPAR, the OS only sees the virtual CPUs (logical processors) allocated to it by the hypervisor, so mpstat reflects activity at that LPAR boundary. It cannot report on physical processors or resources outside the LPAR's scope.

The number of online physical processors in the shared processor pool is hypervisor-level information accessible from the HMC and is not exposed to mpstat running within a guest LPAR.