I wondering how did you measure the latency of the power scaling ?
Actually I am doing some benchmark on SCC. So I think we can exchange some ideas.
Actually my measurement of latency was not that accurate it was just an approximation which I derived using pstencil application given along with the RCCE example set. I ran that application with different number of cores and calculated the time between each pair of RCCE_iset_power() and wait_power().