Add a note on CPU scaling

Author: adithyaov

README.md

@@ -10,6 +10,18 @@ Enable unrestricted use of perf counters:
 # echo -1 > /proc/sys/kernel/perf_event_paranoid
 ```
 
+## Disable CPU scaling
+
+Set the scaling governer of all your cpus to `performance`:
+
+```
+echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
+echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
+...
+...
+echo performance > /sys/devices/system/cpu/cpu7/cpufreq/scaling_governor
+```
+
 ## Generating the eventlog
 
 To generate the event log, we need to compile the program with the eventlog enabled