[linux-audio-user] Again on sudden and occasional Jack crackling sound

[Salvatore Di Pietro]

Jack O'Quin wrote:

[cut]

> What happens if you omit --enable-posix-shm?  System V shm seems to
> work better on Linux.  POSIX shm is mainly used for OSX.

Tried that. I'm still testing it...

64 frames/buffer leads to crackling after a minute or so. Ok, I somehow 
expected that as it's consumer hardware.

Pushed jackd to 128 frams/buffer, fired up xmms with xmms-jack, and in a 
terminal, half a dozen " ls -R / & ".

It seems more robust to my "pound" script, as it takes more pounds to 
wreck the sound, (but also more pounds to restore it)

But sometimes when I fire up ZynAddSubFX, the sound wrecks again... 
Tried that up to 2048 frames/buffer :(


Moreover, using jack_bufsize, or resizing buffer within Ardour, causes 
complete muting of output sound (bit not clients death, as it was 
before), until I restart jack.
Notice that this "complete muting" only affects the output ports, i.e. I 
can continue recording with qarecord, or ardour, I just cannot hear (and 
monitor) anything anymore until I restart jack and its clients.
Also the crackling problem only affects the output ports, as I pointed 
out in the first post (and on jackit-devel)

What other tests can I do?
Thank you

ciao
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