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Why is the condition of MMU enable faster than the condition of MMU disable?

Michi Yama
Guru 10030 points
Other Parts Discussed in Thread: AM3358

Hi, I have one question regarding AM335x performance.

The below is my customer's evaluation result of AM3358 on TI EVM.

As you know from the above results, MMU Enable condition is faster than MMU disable condition instead of cache disable.

I think  CPU performance is down when MMU is enabled.  Because CPU must change the address from the virtual address to physical address.

But customer result is opposite to my thought. Why does MMU enable condition make CPU faster than MMU disable?

Please let me know.

Best regards,

Michi