release/src/router/apcupsd/examples/onbattery.cpufreq

   1 #!/bin/sh
   2 #
   3 # This shell script if placed in /etc/apcupsd will be
   4 # called by /etc/apcupsd/apccontrol when the UPS goes
   5 # on batteries.
   6 #
   7 # We scale the CPU clock frequency back to save power
   8 # and send an email message to root to notify him.
   9 #
  10 # NOTE: Assumes Linux-2.6.x kernel with CPUFREQ
  11 # support for your chipset. Enable appropriate
  12 # modprobe line below to match your hardware.
  13 SYSADMIN=root
  14 APCUPSD_MAIL="/bin/mail"
  15
  16 # Load the appropriate cpufreq module. This is best done
  17 # in boot scripts, but throw it here to make sure it has
  18 # been done.
  19 modprobe p4_clockmod
  20 #modprobe cpufreq-nforce2
  21 #modprobe powernow-k6
  22 #modprobe powernow-k8
  23 #modprobe speedstep-smi
  24
  25 # Give the cpufreq module a chance to initialize
  26 sleep 1
  27
  28 # Iterate over all CPUs, enabling the userspace governor
  29 # and programming the current clock speed to the minimum.
  30 # This is redundant on hyperthread siblings, but it
  31 # doesn't hurt anything and it keeps the code simple.
  32 for CPU in /sys/devices/system/cpu/cpu*/cpufreq ; do
  33         echo -n userspace > $CPU/scaling_governor
  34         cat $CPU/scaling_min_freq > $CPU/scaling_setspeed
  35 done
  36
  37 # Send an email to root
  38 HOSTNAME=`hostname`
  39 MSG="$HOSTNAME Power Failure!"
  40 #
  41 (
  42    echo "Subject: $MSG"
  43    echo " "
  44    echo "$MSG"
  45    echo " "
  46    for CPU in `ls -1 /sys/devices/system/cpu` ; do
  47       echo -n "$CPU freq scaled to "
  48       cat /sys/devices/system/cpu/$CPU/cpufreq/scaling_setspeed | tr -d '\n'
  49       echo " MHz"
  50    done
  51    echo " "
  52    /sbin/apcaccess status
  53 ) | $APCUPSD_MAIL -s "$MSG" $SYSADMIN
  54 exit 0
  55