Am 17.02.2011 18:56, schrieb S. Massy:
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.
I use to check from time to time, if such tricks are still needed.
Now I see that my USB-interface (MAudio mobilePre) can be used under
Fedora14 with CCRMA-Kernel the same as good with -n2.
Anyway: -n3 will not hurt and when it solves your issue...
best regs
HZN
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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