![]() Instantaneous CPU core frequencies for comparison: watch -n2 fgrep MHz /proc/cpuinfoĮvery 2.0s: fgrep MHz /proc/cpuinfo supernova2: Sun Jul 30 01:05:33 2023Ĭpupower application package name depends on Linux distribution (from comments): This is the workload used in the examples below. Average values rarely reach minimum and maximum extremes due to process scheduler migrating threads/processes to other CPU cores to spread heat and wear evenly across all CPU cores (unless threads are pinned to specific cores) they are useful for examining sustained CPU frequencies during long-running (30+ minutes) full loads.įor example, during a workload utilizing half of available CPU cores at 100%, instantaneous core frequencies are everywhere between minimum and maximum, whereas average frequencies are similar and slightly below maximum for all cores. ![]() Instantaneous values can show the minimum and maximum CPU frequency values, which are quite useful for CPU performance tuning. The kernel support can be enabled/disabled using the /sys/devices/system/cpu/cpufreq/boost file.Ĭpupower application measures average CPU frequency over specified time intervals (1 second by default).Īverage values differ from current instantaneous values from /proc/cpuinfo. You can disable the Turbo Boost using the BIOS or some Linux options/commands. Here, the CPU will be at the nominal/minimal value (1.20Ghz) all the time. Note the difference when you run the same command with Turbo Boost disabled: In the boost state support section, the values for Supported and Active are no. ![]() You may find the technical information of these frequencies at the Intel website. Note that the information states the hardware limits ( 1.20 GHz - 3.47 GHz), the possible frequencies ( 3.47 GHz, 3.33 GHz, 2.53 GHz, 1.87 GHz, 1.20 GHz) and the current frequency ( 1.87 GHz). $ cpupower frequency-infoĬPUs which run at the same hardware frequency: 0ĬPUs which need to have their frequency coordinated by software: 0Īvailable frequency steps: 3.47 GHz, 3.33 GHz, 2.53 GHz, 1.87 GHz, 1.20 GHzĪvailable cpufreq governors: conservative, ondemand, userspace, powersave, performanceĬurrent policy: frequency should be within 1.20 GHz and 3.47 GHz. For instance, for an old Intel Core i5-660 with Turbo Boost enabled, you will get the following. To determine if the Turbo Boost is activated and which is the current frequency, you can use cpupower frequency-info. If Turbo Boost is enabled and all the cores are working, the CPU will work at 2.10GHz. ![]()
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