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Linux - "Package Power limit" and "Core power limit" notifications.




Article Summary: This article provides information on Linux - "Package Power limit" and "Core power limit" notifications.

Environment:

  • Linux - Various distributions - It seems to affect systems with kernel 2.6.18 and above.
  • Intel based CPU

Issue:

  • "Core power limit " and "Package power limit " notifications being continuously logged in the /var/log/messages.

Diagnostic Steps:

  • /var/log/messages will show notifications similar to:
    • Jun 21 09:34:55 compute-0-15 kernel: CPU7: Core power limit notification (total events = 1)
    • Jun 21 09:34:55 compute-0-15 kernel: CPU21: Core power limit notification (total events = 1)
    • Jun 21 09:34:55 compute-0-15 kernel: CPU25: Package power limit notification (total events = 1)
    • Jun 21 09:34:55 compute-0-15 kernel: CPU3: Package power limit notification (total events = 1)

Resolution:

  • This issue is currently still being worked by some software vendors.
  • In the meantime, there are 2 possible workarounds:
    • Clear PLN flag adding clearcpuid=229 to grub.conf or;
    • Set the machine's Performance Profile to Max Performance in the BIOS, if that setting is available (Please, be aware that power consumption may increase if this option is chosen).

Note:
  • Power Limit Notification is a feature that was added to the Sandy Bridge processors from Intel. The notification does not indicate a problem, and should not be reported as a Critical-level message.
  • The occurrence of the power limit notification is routine, and the system should not be reporting the messages. They can be ignored.




References:
My system's log shows "Package Power limit" notifications continuously
[Bug 36182] Erroneous package power limit notification since kernel 2.6.39
index : kernel/git/torvalds/linux.git


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Identyfikator artykułu: SLN266056

Data ostatniej modyfikacji: 12/04/2016 06:10 PM


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