#!/bin/sh

# stolen from https://github.com/DropD/fnc-simplex/blob/master/linux_turboboost.sh

# you might need to run sudo apt-get install msr-tools

# Toggle Turbo Boost for Ivy Bridge CPUs (should work for all newer Core)

# Requires a fairly new Linux kernel (let's say 3.0+)

# Written by Donjan Rodic, released for free use

# check current real frequency with sudo turbostat -s -i1

sudo modprobe msr

# all_cores FOO

# perform FOO(i) for each core i

all_cores() {

NPROCS=`cat /proc/cpuinfo | grep "core id" | wc -l`

NPROCS=$(($NPROCS - 1))

for i in `seq 0 1 $NPROCS`; do

$1 $i

done

}

# report Turbo Boost state on core $1

read_tb() {

ret=`sudo rdmsr -p"$1" 0x1a0 -f 38:38`

[ $ret -eq 0 ] && echo "$1": on || echo "$1": off

}

# enable Turbo Boost on core $1

enable_tb() {

sudo wrmsr -p"$1" 0x1a0 0x850089

}

# disable Turbo Boost on core $1

disable_tb() {

sudo wrmsr -p"$1" 0x1a0 0x4000850089

}

if [ "$1" = "on" ]; then

all_cores enable_tb

all_cores read_tb

elif [ "$1" = "off" ]; then

all_cores disable_tb

all_cores read_tb

elif [ "$1" = "list" ]; then

all_cores read_tb

else

echo "usage: turboboost.sh on | off | list"

fi