Why do some files in the /sys directory show unexpected CPU speed values when using Ampere Altra or Ampere Altra Max CPUs?
Environment
- A system using Ampere Altra or Ampere Altra Max CPUs
- Red Hat Enterprise Linux for ARM 64 8.x or 9.x
Issue
Why do some files in the /sys directory show unexpected CPU speed values when using Ampere Altra or Ampere Altra Max CPUs?
Resolution
Due to a firmware issue, incorrect information is being reported in the *_cur_freq files within the /sys/devices/system/cpu/cpu#/cpufreq directory on systems running Red Hat Enterprise Linux for ARM 64 8.x or 9.x using Ampere Altra and Ampere Altra Max CPUs.
The system is running at the appropriate frequencies, the issue only affects the reported values. Please visit Ampere's download site and download firmware package entitled "Ampere SRP 2.10a.20220913 Binary Package Release : 09-13-2022" or newer to resolve the issue.
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