Dell R720 power_saving进程导致CPU虚高

参考资料：

http://lvii.github.io/system/2014/02/19/acpi-cause-high-loadavg-with-low-cpu-usage/

http://en.community.dell.com/support-forums/servers/f/1466/t/19456558

http://www.linuxquestions.org/questions/linux-server-73/high-load-average-low-cpu-usage-on-centos-5-4-64-bit-794709/

http://www.linuxquestions.org/questions/linux-newbie-8/high-cpu-load-but-low-cpu-usage-high-idle-cpu-902632/

http://www.linuxquestions.org/questions/linux-server-73/problem-in-ubuntu-server-12-04-64bit-4175432492/

解决办法：

/etc/modprobe.d/blacklist.conf   加入acpi_pad

blacklist acpi_pad

改模块加载的配置文件，之后重启服务器