corefreq 1.86.7 Measure performance data & tweak low-level settings on x86-64 CPUs

CoreFreq is a CPU monitor that reports low-level processor settings and performance data with notably high precision by using a loadable Linux kernel module. Unlike most similar tools, it can be used to modify some settings if supported by the hardware and at your own risk. It's designed for 64-bit x86 Intel processors (Atom, Core2, Nehalem, SandyBridge, and newer) and compatible architectures like AMD Zen and Hygon Dhyana.

Supported processor features include:

  1. time spent in C-states, including C1/C3 Auto- and UnDemotion;

  2. core temperatures, voltage, and tweaking thermal limits;

  3. core frequencies, ratios, and base clock rate;

  4. enabling, disabling, and testing SpeedStep (EIST), Turbo Boost, and Hyper-Threading or SMT;

  5. enabling or disabling data cache prefetching;

  6. kernel assembly code to keep as near as possible readings of performance counters such as the TSC, UCC, and URC;

  7. the number of instructions per cycle or second (IPS, IPC, and CPI);

  8. memory controller geometry and RAM timings;

  9. running processes' CPU affinity.

This package provides the corefreqd data collection daemon, the corefreq-cli client to visualise and control it in real time, and the corefreqk kernel module in its own separate output. Read the included before loading it.