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On 07/01/2013 05:16 PM, Patrick Shirkey wrote:
>
> On Tue, July 2, 2013 12:44 am, Jeremy Jongepier wrote:
>> On 07/01/2013 04:12 PM, Patrick Shirkey wrote:
>>> IIUC the potential issues with period sizes with non powers of
>>> two are at the application level. JACK is agnostic about it.
>>>
>>
>> Yes, guitarix for instance doesn't like period sizes that are not
>> a power of two.
>>
>>> Anyway it's a little spooky that you get better performance
>>> with -p64 than -p128 even in playback only mode.
>>
>> Well I'm testing and haven't done any real stress-tests yet.
>> Maybe it was a one-off. At least I get undistorted sound out of
>> this device. Now if I could only figure out why JACK bails out
>> every once so often.
>
> Does this happen with or without wifi enabled?
>
>> And why full-duplex doesn't work, well, it works but the audio
>> coming out is distorted.
>>
>
> System load causing distortion on the Audio device in duplex mode.
> It suggests something is wrong with the bus and or interrupts but I
> don't see why it would be ok in playback only mode. Not sure if it
> is related but I have noticed that my old usb quattro often takes a
> while to warm up. Sometimes I have to run it for a few hours and
> start/stop jack several times to get undistorted output.
>
> Another issue is the Rockchip devs probably haven't tested the
> device at low latency with duplex mode so they haven't picked up
> that issue. We can try flagging it with them.
>
> I forgot what the audio chipset is. Can you post the output of cat
> /proc/asound/cards?
>
jeremy@rk3066:~$ cat /proc/asound/cards
0 [RK29RK1000 ]: RK29_RK1000 - RK29_RK1000
RK29_RK1000
1 [HDMI ]: ROCKCHIP_HDMI - ROCKCHIP HDMI
ROCKCHIP HDMI
2 [Device ]: USB-Audio - Generic USB Audio Device
Generic USB Audio Device at usb-usb20_host-1.1,
full speed
'Device' is a $2 USB audio interface with a C-Media chipset. But I got
one step further:
jeremy@rk3066:~$ uname -a
Linux rk3066 3.0.36-rt58 #1 SMP PREEMPT RT Thu Jul 4 13:18:23 CEST
2013 armv7l GNU/Linux
So I've got a RT kernel running on it. Moving on :)
Jeremy
>
>
>
> -- Patrick Shirkey Boost Hardware Ltd
> _______________________________________________ Linux-audio-user
> mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx
> http://lists.linuxaudio.org/listinfo/linux-audio-user
>
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