### Disable c-states
```
grep -E '^model name|^cpu MHz' /proc/cpuinfo
pgrep -lf ondemand
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done
service cpuspeed stop
lsmod | grep ondemand
grep -E '^model name|^cpu MHz' /proc/cpuinfo

# cpu freq
turbostat --debug -P
# C States
sudo cpupower monitor -m Idle_Stats

# disable intel_idle driver
grubby --default-kernel
grubby --info /boot/vmlinuz-3.10.0-514.21.2.el7.x86_64
grubby --args="intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll"  --update-kernel /boot/vmlinuz-3.10.0-514.21.2.el7.x86_64
grubby --info /boot/vmlinuz-3.10.0-514.21.2.el7.x86_64

```