While cyclictest focuses on scheduler latency, modern RTOSes require a more holistic view. This talk presents a new, unified benchmark framework for any POSIX-compliant RTOS(including AGL/PREEMPT_RT) on ARM. We go beyond cyclictest to measure critical E2E system latencies, including ISR, task preemption, IPC, and multi-core lock contention. By using a high-resolution & low overhead timer and collecting hardware performance counters, our framework provides a complete picture of RTOSes system's hard determinism and predictability.