Oracle Linux 5.9到Oracle Linux 6.4 之间的bug--Wrong Kernel Statistic in Version 2.6.39-400.X.X
参考自： Wrong Kernel Statistic in Version 2.6.39-400.X.X (Doc ID 1552713.1)
适用于： Linux OS - Version Oracle Linux 5.9 with Unbreakable Enterprise Kernel [2.6.39] to Oracle Linux 6.4 with Unbreakable Enterprise Kernel [2.6.39] [Release OL5U9 to OL6U4] Linux x86-64 Linux x86
症状： 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
改变： The system was upgraded to a UEK kernel with a version later than 2.6.39-400
原因： unpublished BUG 16567925 - INCORRECT CPU UTILIZATION STATS WITH 2.6.39-400.17.1
