CoreFreq

What CoreFreq is

CoreFreq is free CPU monitoring software for Linux, built around a kernel module, daemon and command-line client. It reads processor frequencies and ratios, performance counters, instructions per cycle, C-states, temperature and documented core-voltage readings. Its views also identify processor features, brand and architecture, and show a topology map that includes caches. The driver exposes controls for Turbo Boost, power management, thermal limits, prefetchers and hardware-controlled performance states. Supported architectures listed by the project include Intel and AMD families, Arm A64, RISC-V RV64 and PowerPC64 LE. CoreFreq requires Linux kernel version 3.3 or newer and GNU C Library. Users can build it from source or use distribution options including ArchLinux AUR, Gentoo, Debian, Ubuntu, TUXEDO, Fedora, AlmaLinux and Rocky Linux. The project says its kernel module uses shared memory to protect the kernel from the user-space component. Some virtual machines may not expose registers required by the driver; module signing is needed when kernel signature verification is enabled. Its interface works best in an ASCII console or VT100-capable Xterm and can stall below 80 columns.