Introduction

Figure 1CPU Frequency Scaling Monitor

The CPU Frequency Scaling Monitor provides a convenient way to monitor the CPU Frequency Scaling for each CPU.

To add CPU Frequency Scaling Monitor to a panel, right-click on the panel to open the panel popup menu, then choose Add to Panel ▸ CPU Frequency Scaling Monitor.

Unfortunately, CPU frequency scaling can currently only be monitored on Linux machines that have support in the kernel. It can however, support the several generations of frequency scaling interfaces in the kernel.

When there is no CPU frequency scaling support in the system, the CPU Frequency Scaling Monitor only displays the current CPU frequency.

When CPU frequency scaling is supported in the system, the CPU Frequency Scaling Monitor displays the CPU icon with a progress bar. The state of the progress bar represents the current CPU frequency with respect to the maximum frequency.

By default the CPU Frequency Scaling Monitor displays the current CPU frequency as a value in Hertz (the standard measure of frequency), but can be configured to display a percentage instead. For more information on how to configure CPU Frequency Scaling Monitor see Section 2 ― Preferences.

Each instance of CPU Frequency Scaling Monitor can monitor only one CPU. You must start an instance of CPU Frequency Scaling Monitor for each CPU that you want to monitor if you are in a multiprocessor (SMP) system.

1.1. Understanding the Icons

The CPU Frequency Scaling Monitor has a series of icons that graphically represent the current scaling level of the processor you are monitoring. They are:

Icon Description
The CPU is running at, or close to, 100% throughput
The CPU is running at, or close to, 75% throughput
The CPU is running at, or close to, 50% throughput
The CPU is running at, or close to, 25% throughput

1.2. Frequency and Governor Selector

The Frequency Selector functionality may not be available on your GNOME Desktop by default. Please consult your system administrator, vendor documentation, or the documentation that came with this software.

To set the CPU frequency, (left-)click on the monitor and a menu will be shown. This menu will offer you a list of available frequencies and/or frequency governors for your machine.

You can choose whether you want to show available frequencies or governors in the Preferences. See Section 2 ― Preferences for more information.

Figure 2Frequency selector showing just frequencies
Figure 3Frequency selector showing both frequencies and governors