The CPU timer described in CPU Cycle Counter is applicable for homogenous systems only. Specifically, the CPU frequency should match across the systems.
For heterogeneous systems with different CPU frequencies, a special Normalized CPU timer (VT_TIMER=CPU_Norm) can be used. This timer is based on the Timer Stamp Counter (TSC) CPU ticks as well as the original CPU timer (VT_TIMER=CPU). The normalized timer converts the local CPU ticks into microseconds on the fly to allow usage of TSC on heterogeneous systems.