frequent update_cpu_power messages in the system logs
This document (7015325) is provided subject to the disclaimer at the end of this document.
SUSE Linux Enterprise Server 11 Service Pack 2 (SLES 11 SP2)
Log messages relating to update_cpu_power appear frequently in the system logs:
Jun 6 13:17:12 myhost kernel: [87824625.772466] update_cpu_power: cpu_power = 28614818560; scale_rt = 49748003745
Jun 6 13:17:12 myhost kernel: [51795828.865150] update_cpu_power: cpu_power = 24528796992; scale_rt = 42644292225
Jun 6 13:17:12 myhost kernel: [87824626.024221] update_cpu_power: cpu_power = 21251351804; scale_rt = 36946323002
Jun 6 13:17:12 myhost kernel: [87824626.036207] update_cpu_power: cpu_power = 20892174701; scale_rt = 36321879278
Jun 6 13:17:14 myhost kernel: [87824627.762462] update_cpu_power: cpu_power = 28542184816; scale_rt = 49621727084
These messages may have non-consecutive timestamps.
In the example above, it can be seen that the timestamps from the kernel are not
Jun 6 13:17:12 myhost kernel: [87824625.772466]
Jun 6 13:17:12 myhost kernel: [51795828.865150]
Jun 6 13:17:12 myhost kernel: [87824626.024221]
SLES 11 SP2 is not effected by the issue, however a patch has been provided as a
precautionary measure in kernel-3.0.101-0.7.19.1, which is available to customers with
Long Term Service Pack Support (LTSS).
Customers who have LTSS for SLES 11 SP1 can update to kernel-188.8.131.52-0.13.1 or later.
Cold booting the system at a minimum of every 208 days should avoid the issue.
aberrations, and also to prevent any anomalous value returned by scale_rt_power()
from being stored in load balancing structures to be encountered at some later time.
As a safety measure was implemented to avoid potential overflows in the clocksource.
Also, changes were made to limit the number of update_cpu_power messages that would
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- Document ID:7015325
- Creation Date:03-JUL-14
- Modified Date:07-JUL-14
- SUSESUSE Linux Enterprise Server
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