How to completely disable CPU "C-state" when CPUidle driver shows acpi_idle or intel_idle?

Solution Verified - Updated -

Issue

  • CPUidle driver displays acpi_idle after setting intel_idle.max_cstate=0 processor.max_cstate=0 into kernel boot parameters. How to completely disable CPU "C-state" using kernel parameters?
$ cat /sys/devices/system/cpu/cpuidle/current_driver
acpi_idle

 $ cpupower idle-info --silent
CPUidle driver: acpi_idle   
CPUidle governor: menu
::::

Environment

  • Red Hat Enterprise Linux 8.6
  • Kernel 4.18.0-372.9.1.el8.x86_64

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