[Voyage-linux] high power consumption of rt kernel for cubieboard2

[Kim-man 'Punky' TSE]

On 5/28/2014 1:29 PM, Joseph Chu wrote:
>
> Hello all,
> i installed the kernel-cubieboard2-3.4.75.2-voayge-rt93+ it run smoothly but i found it consumed much more power then 
> the non realtime kernel as i feel my power supply is much hotter. how can i reduce the consumption in this kernel? i 
> dont want to roll back to 3.4.67.
>
First, use "top" to monitor the CPU consumption if there are anything wrong.

then command:

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq

will show you that 2 cores are run in full speed.

You could change the cpu frequency or adjust the governor... But I would like to have it full speed for performance, 
i.e. less risk for jitters.

e.g.
echo "ondemand" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo "ondemand" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor

to change to ondemand cpu speed.

-- 
Regards,
Kim-man "Punky" Tse

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