How to custom CPU power management?

I’m running volumio on raspberry pi, and I found that i can ‘‘Custom CPU power management for increased performances’’ in the changelog of version 2.323. i tried the same command of raspbian to config CPU, but it didn’t work. so anyone knows how to custom CPU in ‘terminal?’ or …
i am living in non-English-speaking country .so please forgive me the mistakes in my english
i wish i have described my question clearly.