cpufreq-set.md: add page

pages/linux/cpufreq-set.md

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+# cpufreq-set
+
+> A tool to modify CPU frequency settings.
+> Requires root privileges. 
+
+- Set the CPU frequency policy of CPU 1 to "userspace":
+
+`sudo cpufreq-set -c {{1}} -g {{userspace}}`
+
+- Set the minimum CPU frequency of CPU 1:
+
+`sudo cpufreq-set -c {{1}} --min {{min_frequency}}`
+
+- Set the maximum CPU frequency of CPU 1:
+
+`sudo cpufreq-set -c {{1}} --max {{max_frequency}}`
+
+- Set the work frequency of CPU 1 (requires "userspace" policy to be loaded):
+
+`sudo cpufreq-set -c {{1}} -f {{work_frequency}}`