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How long does it take for Cortex A53 to exit low power state?

Oscar Huang

Hi, 

The ARMv8A architecture profile shared an example of using WFE in the implementation of spinlock. I'd like to know how long it might take for Cortex A53 to exit from lower power state. If it is too long, I may prefer just using a tight loop in my spinlock implementation. My SoC has a few Cortex A53 clusters, and the performance is critical. 

Thanks

-Oscar

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