The first thing to do here was to check the reason for this unusual request. Do not immediately attempt to change the CPU frequency without understanding the implication of such changes.
The second thing to do, was to check the current cpu frequency. This can achieved by either:
1. Installing nice set of tools called cpupowerutils:
yum install cpupowerutils
Next, check the frequency with cpufreq-info:
[root@mario~]# cpufreq-info analyzing CPU 0: driver: acpi-cpufreq CPUs which need to switch frequency at the same time: 0 hardware limits: 1.33 - 2.00 GHz available frequency steps: 1.33 GHz, 1.60 GHz, 2.00 GHz available cpufreq governors: userspace, ondemand, conservative, powersave, performance current policy: frequency should be within 1.33 MHz and 2.00 GHz. The governor "conservative" may decide which speed to use within this range. current CPU frequency is 1.33MHz.
2. Without cpupowerutils, you can look at sysfs
ls /sys/devices/system/cpu/cpu[cpu number]/cpufreq/
You will find there the max, min and current cpufrequency with other bunch of useful files
Now, to change to cpu frequency to maximum can by done also by either:
1. Using cpupowerutils
cpupower frequency-set -g performance
2. setting the the wanted value in sysfs
echo 1300000 > /sys/devices/system/cpu/cpu[cpu number]/cpufreq/scaling_min_freq
This will not allow the CPU getting below the specified value
### Be sure you understand what you are trying to achieve ###
You can find the full documentation HERE
