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linux下关闭服务器的CPU（睿频）自动降频
因为在负载低的时候，CPU工作在较低的频率，为了节能，但在服务器突发访问时，CPU不断在高低频率上切换，所以需要关闭自动降频。
[email protected]:~# grep -E '^model name|^cpu MHz' /proc/cpuinfo model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 1600.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 1600.000 [email protected]:~# for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done [email protected]:~# grep -E '^model name|^cpu MHz' /proc/cpuinfo model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000 model name : Intel(R) Xeon(R) CPU E3-1220 V2 @ 3.10GHz cpu MHz : 3101.000
永久关闭：
If you are running 'cpuspeed', 'cpufreqd', 'powerd' or other daemons, that can control CPU stepping, just stop them, if you really need to run your system on 100% of the CPU speed.
On CentOS:
On CentOS:
On Linux 2.6.32 (On RedHat 6, and Oracle Unbreakable Linux 6) remove CPU scaling kernel modules:
