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December 2023

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Setting CPUFreq scaling governor to performance not setting CPU frequency to the highest
by Vigneshwar S Dec. 5, 2023

Dec. 5, 2023

Hello everyone! I've read about the CPU performance scaling in Linux kernel documentation <https://docs.kernel.org/admin-guide/pm/cpufreq.html> and tried experimenting with multiple scaling governors. Based on the documentation, the performance scaling governor <https://docs.kernel.org/admin-guide/pm/cpufreq.html#performance> should set the frequency to the maximum possible frequency. I've got two machines with different kernel versions: v3.10.0 (CentOS 7) and v5.10.106 (Debian 11). When I set the 'scaling_governor' to 'performance' in the CentOS machine, it is working as expected and the CPU frequency is set to the maximum possible frequency statically. But when I set the 'scaling_governor' to 'performance' in the Debian machine, that's not the case and the CPU frequency is changing dynamically. I've read that 'intel_pstate' scaling driver would bypass the scaling governor and set the CPU frequency based on its internal pstate information. But in both CentOS and Debian machines, the 'scaling_driver' is set to 'acpi-cpufreq' only. How can I solve this? Any help on this would be greatly appreciated. Thanks! Vigneshwar S

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