CPU Performance Scaling feature does not work as expected

Solution In Progress - Updated -

Environment

  • Red Hat Enterprise Linux 8
  • FUJITSU MP1000 system
  • FUJITSU Supercomputer PRIMEHPC FX1000 system
  • FUJITSU Supercomputer PRIMEHPC FX700 system
  • Cray CS500 S3812 system

Issue

  • CPU Performance Scaling feature does not work as expected.
  • The CPU of FUJITSU MP1000 system always runs at the consistent frequency even when the load changes.
  • The CPU of FUJITSU Supercomputer PRIMEHPC FX1000 system always runs at the consistent frequency even when the load changes.
  • The CPU of FUJITSU Supercomputer PRIMEHPC FX700 system always runs at the consistent frequency even when the load changes.
  • The CPU of Cray CS500 S3812 system always runs at the consistent frequency even when the load changes.

Resolution

  • The CPU performance scaling feature on the FUJITSU MP1000 / FUJITSU Supercomputer PRIMEHPC FX1000 / FUJITSU Supercomputer PRIMEHPC FX700 / Cray CS500 S3812 systems require the third-party driver in order to function as expected.
  • The hardware vendor is responsible for the delivery and the support of the driver.
  • The installation of the 3rd party driver will taint the RHEL kernel. The hardware vendor’s support can effectively separate the 3rd party driver issues from that of RHEL.
  • Contact the hardware vendor support team for further information.

Root Cause

  • FUJITSU MP1000 / FUJITSU Supercomputer PRIMEHPC FX1000 / FUJITSU Supercomputer PRIMEHPC FX700 / Cray CS500 S3812 systems are equipped with the CPU performance scaling feature which requires the 3rd party driver from the hardware vendor to function as expected.

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