Power Measurement of TX2

Hi! I am trying to achieve energy efficient work on TX2 board. But I have a strange observation, when I set the two Denver cores or four A57 cores to lowest frequency using governor ‘powersave’ and the others are ‘performance’ mode, the power I read from path ‘/sys/devices/3160000.i2c/i2c-0/0-0041/iio_device/in_power1_input’ is almost the same with the power when all cores are ‘performance’.

In general, when we lower the frequency, the power should decrease. So I am wondering why TX2 is like this?

Yes, it should be. What is the frequency device is running after you change the governor from powersave to performance?