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

[Joseph Chu]

hello Punky,
thanks your advice!
as mention about jitter, how can i monitor the jitter (error) in the usb
port to the dac?
thanks!
Joseph
On Jun 4, 2014 10:05 AM, "Kim-man 'Punky' TSE" <punkytse at punknix.com> wrote:

> 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
>
> * Open Source Embedded Solutions and Systems
>   - Voyage Linux (http://linux.voyage.hk)
>   - Voyage MPD   (http://linux.voyage.hk/voyage-mpd)
>   - Voyage MuBox (http://mubox.voyage.hk)
> * Voyage Store   (http://store.voyage.hk)
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.voyage.hk/pipermail/voyage-linux/attachments/20140604/ba164382/attachment.html>