Thank you very much,
I did enabled the two denver cores several months ago after your kind assistance.
We test the performance then, the performance did not take any improvement. The reason maybe that the 4 ARM cores are enough for our algoithm, while the ability of GPU being the limitation. Thus, the additional two denver cores are redundant even though they took the majority of the cpu calculations.
We would try to add more loads on the cpu in order to see if the optimization for cpu scheduling is problematic or it is the power management who limited the performance of the two denver cores.
Finally, thank you for your patience and the Nvidia team supports.