Re: [Jack-Devel] Debugging Jack Clients

On 09/06/2011 01:29 PM, ccrome wrote:
> Ah, perhaps I've found the issue.  I guess when Jack try to re-start, it
> reconfigures the codec.  I'm using a custom audio card that takes some

No... it shouldn't try to reconfigure the codec.

> time to re-configure, and it seems to enter a continuous loop where it
> tries to configure the codec, then it gets an xrun, so it tries again.

If this loop is happening... it's a side-effect of the Real Problem. 
This is OMAP3, right?

>         creating alsa driver ...
>         hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|16bit
>         control device hw:0
>         configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer
>         = 2 periods

Try setting larger buffers.  E.g. -p 4096 -n 4

>         # gdb client
>         gdb> break process
>         gdb> run
>         Starting program:
>         /home/caleb/mmfx/platform/platform_beagle/puppy_driver/jack_scripts/jack_sine
>
>         [Thread debugging using libthread_db enabled]
>         [New Thread 0x40a73470 (LWP 22052)]
>         engine sample rate: 48000
>         [New Thread 0x412f6470 (LWP 22055)]
>            ^C
>         Program received signal SIGINT, Interrupt.
>         0x401e9f44 in nanosleep () from /lib/arm-linux-gnueabi/libc.so.6
>         (gdb) bad status (254) for client sine handling event (type = 8)
>         bad status (254) for client sine handling event (type = 8)
>         bad status (254) for client sine handling event (type = 8)
>         gdb>
>         gdb> continue
>
>
>     The callback 'process' is never called again, and the jackd_log file
>     is filled with alsa xruns.
>
>     Any thoughts?

Even though you set the timeout at 50 seconds... it appears that this 
error came because you didn't respond to an EVENT NOTIFICATION within 2 
seconds.  (The 2secs is not configurable.)  Event type 8 is an xrun. 
Did you perhaps set an xrun callback?  If you did, I recommend that you 
disable it while debugging.

-gabriel

1315363112.4200_0.ltw:2,a <4E66D900.5010809 at gmail dot com>