I am overclocking my raspberry pi. I have selected the turbo option from the raspi-config. I have found out however that the Pi was not running consistently at 1GHz. I have tried setting the governor (in root using echo ...) to "performance" however it reverts to the default "on demand" after reboot. I need the pi to run consistently at 1 GHz so I decided to select the force_turbo=1 at config.txt. However, it does not run consistently at the set arm frequency but runs at the default 700MHz even at 45% cpu load while running my code. I have check the temperature, cpu load, and arm_freq using vcgencmd (get_config, measure_temp, measure_clock) command.
Isn't the force turbo option suppose to disable dynamically changing clock frequencies and set the arm frequency set at config.txt consistently even at low load?
Here's my config.txt:
gpu_mem=64
start_x=1
dtparam=spi=on
dtparam=i2c1=on
dtparam=i2c1_baudrate=400000
dtparam=i2c_arm=on
dtparam=i2c_arm_baudrate=400000
force_turbo=1
arm_freq=1000
core_freq=500
sdram_freq=600
over_voltage=6
Here's my rc.local:
#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
sudo echo performance > sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
exit 0
EDIT:
I have found the culprit. It was an undervoltage problem due to what supply I used. The problem was solved by using a separate supply. An indicator of an undervoltage problem is the appeareance of a multicolored square at the upper right corner of the desktop as well as the simultaneous flickering/blinking of the red power led of the pi. Undervoltage automatically disables force turbo to protect from sd card corruption.
