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" <[email protected]> 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) > >
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