I'm running Ubuntu 16.04 with CPU: i7-6700. Even with one of the cores sitting on 100% utilisation
... analyzing CPU 7: driver: intel_pstate CPUs which run at the same hardware frequency: 7 CPUs which need to have their frequency coordinated by software: 7 maximum transition latency: 0.97 ms. hardware limits: 800 MHz - 3.50 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 800 MHz and 3.50 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 800 MHz.
Each CPU shows 800 MHz. How do I get my CPU frequency to increase under load?