Current situation

Currently AMD's scaling drivers are not compiler in flatcar's kernel (stable & beta channel)

 ~ # zgrep PSTATE /proc/config.gz
CONFIG_X86_INTEL_PSTATE=y
# CONFIG_X86_AMD_PSTATE is not set
# CONFIG_X86_AMD_PSTATE_UT is not set

Impact

AMD new EPYC + ryzen CPU use acpi-cpufreq instead of amd-pstate epp mode reducing performance.

Ideal future situation

Enabling CONFIG_X86_AMD_PSTATE + CONFIG_HZ_{100,250,300} in kernel config for future release.

Implementation options

Enabling CONFIG_X86_AMD_PSTATE + CONFIG_HZ_{100,250,300} in kernel config for future release.