Comparing CPU usage % across machines (or even runs on the same machine) without know the p-state doesn't make for a good comparison. This is especially true if

Comparing CPU usage % across machines (or even runs on the same machine) without know the p-state doesn't make for a good comparison. This is especially true if you're on a fairly new processor with wide frequency operation range, 5% @ 1.3Ghz != 5% @ 3.5Ghz