Re: [LAU] Jack conking out, How to debug?

On Wed, Feb 16, 2011 at 08:38:54PM +0100, Jeremy Jongepier wrote:
> On 02/16/2011 08:27 PM, S. Massy wrote:
> >Hello, all,
> >
> >So, thanks to the excellent advice received on this list, I recently
> >purchased a Roland UA25EX and it works just great, and out of the box at
> >that.
> >
> >Also thanks to this list, I now have my RT kernel sorted out, lean and
> >mean as ever. All great!
> >
> >With my (crappy) internal sound interface, I used to be able to leave
> >jack running for days at "-p128" without any problem, at least with my
> >new kernel. With my new USB soundcard, however, jack works flawlessly
> >for a few hours and then abruptly exits saying something to the effect
> >that jack timed out and the watchdog is doing its painful duty.
> >
> >Here is my jack command-line:
> >$ jackd -P61 -t100 -d alsa -d hw:2,0 -p128 -r 44100
> >
> >I tried adding "-v" for good measure and redirecting to a file, here's
> >what it looks like before the downfall:
> >-Couple 100K of boredom- [...]
> >load = 0.2478 max usecs: 4.000, spare = 1447.000
> >load = 0.2273 max usecs: 3.000, spare = 1448.000
> >load = 0.2859 max usecs: 5.000, spare = 1446.000
> >(and then tonnes of)
> >**** alsa_pcm: xrun of at least 0.029 msecs
> >**** alsa_pcm: xrun of at least 0.025 msecs
> >**** alsa_pcm: xrun of at least 0.026 msecs
> >**** alsa_pcm: xrun of at least 0.024 msecs
> >---and so forth until jackd gets killed.
> >
> >Does anyone know what the problem could be? Is something wrong with my
> >jackd command-line? Is there anything further I can do to debug?
> >
> >Cheers,
> >S.M.
> >
>
> Hello, what distro are you using? And did you also check your system
> logs to see if anything happened around that time? And try using -n
Debian squeeze/custom RT kernel. And no, logs/dmesg didn't reveal
anything.

> 3, I think JACK uses 2 by default for the ALSA backend and the man
> page recommends a setting of 3 for USB cards.
Ahh, that's what happens when you don't do your homework. I left jack to
run all night with "-n3" and "-p64" and so far, nothing, save a few
xruns of 0.0x ms.

Thanks,
S.M.

>
> Best,
>
> Jeremy
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