#!/bin/bash

# TeknoHog's cpufreq script for Linux 2.6
# Written for a Pentium M Dothan 725, but it should work for any CPU 
# whose frequency can be adjusted by the Linux 2.6 driver.

# The userspace portion with fixed frequencies may have to be adjusted 
# per CPU model.

function od_finetune() {
    cd ondemand
    
    # these two are load limits in percentage:

    # if load is below this, slow down cpu
    #echo 70 > down_threshold

    # if load is over this, speed up cpu
    #echo 90 > up_threshold

    #cat sampling_rate_min > sampling_rate
    #echo 1 > sampling_down_factor

    echo 0 > ignore_nice_load

    #echo 100000 > sampling_rate

    cd ..
}

function c_finetune() {
    cd conservative
    
    # these two are load limits in percentage:

    # if load is below this, slow down cpu
    echo 70 > down_threshold

    # if load is over this, speed up cpu
    echo 90 > up_threshold

    echo 1 > ignore_nice_load

    # percent of max freq, for me it's actually 12.5
    echo 15 > freq_step

    echo 1 > sampling_down_factor

    # samping_rates are actually timeslice lengths in microseconds, 
    # so minimum gives fastest transitions (duh!)
    #cat sampling_rate_min > sampling_rate

    # The default seems to change between kernels. 1e5 was the default for
    # some time before 2.6.30, the new shorter one is noisier
    echo 100000 > sampling_rate

    cd ..
}

function usage() {
    echo "Usage: `basename $0` OPTION
where OPTION is one of the following:

max or min   (should be obvious)
c            Conservative: increase/decrease clockspeed smoothly as needed
od           Ondemand: More aggressive than conservative
(number)     Fixed clockspeed in integral multiples of 100 MHz"
}

cd /sys/devices/system/cpu/cpu0/cpufreq

case "$1" in
    perf|max)
    echo performance > scaling_governor
    ;;	
    
    quiet|min)
    echo powersave > scaling_governor
    ;;

    [0-9]|[0-9][0-9])
    echo userspace > scaling_governor
    echo "$1"00000 > scaling_setspeed    
    ;;    
    
    od)
    echo ondemand > scaling_governor
    od_finetune
    ;;

    c)
    echo conservative > scaling_governor
    c_finetune
    ;;

    -h|--help)
    usage    
    echo
    ;;

    *)
    cd stats
    for file in *; do
	echo $file:
	cat $file
        echo
    done
    cd ..
    ;;
esac            

readfreq=`cat scaling_cur_freq`
governor=`cat scaling_governor`
echo frequency: $readfreq kHz
echo governor: $governor