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Package power limit normal

Problem

Sometimes message 'Package power limit normal' happend in /var/log/messages

Error in messages log:

Mar 5 22:01:51 sdw2 kernel: CPU17: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU7: Core power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU23: Core power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU22: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU19: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU21: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU5: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU7: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU23: Package power limit normal
Mar 5 22:01:51 sdw2 kernel: CPU2: Core power limit normal

Cause

  • Issue seems to affect systems with kernel 2.6.18 and above. 
  • Intel based CPU.

Solution

This issue is currently still being worked by software vendors.

In the meantime, there are 2 possible workarounds:

  1. Clear PLN flag adding clearcpuid=229 to grub.conf or;
  2. Set the machine's Performance Profile to Max Performance in the BIOS, if that setting is available 

(Be aware that power consumption may increase if this option is chosen).

Note

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

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