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果然是6.4版本的一个bug。
When running continuously, both mpstat and sar will occasionally report 0% for all of the various cpu times, including idle. A single mpstat will
report odd usage even on a mostly idle machine, for example:
Linux 2.6.39-400.17.2.el6uek.x86_64 (test.oracle.com)
11:14:25 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle
11:14:25 all 3.44 0.10 4.38 3.97 0.00 0.06 50.82 0.00 37.23
CHANGES
The system was upgraded to a UEK kernel with a version later than 2.6.39-400
CAUSE
unpublished BUG 16567925 - INCORRECT CPU UTILIZATION STATS WITH 2.6.39-400.17.1
SOLUTION
Upgrade to kernel 2.6.39-400.22.1 or later. |
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