[ltp] this script controles on my t60 the cpufunctions i use

Wed, 16 Aug 2006 13:17:08 +0200

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Alfredo Matos wrote:
> Hi,
> 
> So this enables and disables the second core.
> You do this for powersave reasons i presume. Do you have a notion of the
> battery gain, i mean, how much more (in minutes) are you able to squeeze
> out of the battery ?
no idea, never tested.
the use of the script is easy (place it as /usr/local/sbin/ and makr it 
executable)
i named it switch_core.sh
"reset all" configures ondemand on both cores.
"reset" configures second core online and ondemand
"0" disables second core saving governor
"1" enables second core restoring saved status
i also have suspend prepare and resume scripts to save the cpu 
configuration when using hibernate scripts.
florian
> 
> Best regards, and nice work.
> 
> Alfredo Matos
> 
> Florian Manschwetus wrote:
>> ok it is a little bit bash.
>> use it or read it for informations how it work
>> or just skip it ;)
>> florian
>>
>> #!/bin/bash
>>
>> CPU1_STATE=$(cat /sys/devices/system/cpu/cpu1/online)
>> echo state read from cpu
>>
>> if [[ ${1} == 0 && ${CPU1_STATE} == 1 ]]; then
>>         echo disabling
>>         CPU1_GOVERNOR=$(cat
>> /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor)
>>         echo governor readed
>>         echo -e "CPU1_GOVERNOR=${CPU1_GOVERNOR}\n" > /tmp/core1_state
>>         echo state saved
>>         echo userspace >
>> /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
>>         echo 0 > /sys/devices/system/cpu/cpu1/online
>>         echo cpu now offline
>> fi
>>
>> if [[ ${1} == 1 && ${CPU1_STATE} == 0 ]]; then
>>         echo enabling
>>         source /tmp/core1_state
>>         echo state read
>>         rm /tmp/core1_state
>>         echo file deleted
>>         echo 1 > /sys/devices/system/cpu/cpu1/online
>>         echo cpu now online
>>         echo ${CPU1_GOVERNOR} >
>> /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
>>         echo governor restored
>> fi
>>
>> if [ ${1} == "reset" ]; then
>>         echo reset
>>         if [ ${2} == "all" ]; then
>>                 echo ondemand >
>> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
>>         fi
>>         if [ ${CPU1_STATE} == 0 ]; then
>>                 echo cpu is down
>>                 echo 1 > /sys/devices/system/cpu/cpu1/online
>>                 echo cpu now online
>>         fi
>>         echo setting governor
>>         echo ondemand >
>> /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
>>         echo governor set to ondemand
>> fi
> 

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