On 02/02/2011 08:29 PM, Kim Cascone wrote:
> I've also been having some issues with xruns (mostly while using the
> zynaddsubfx synth) and have been fiddling with my Jack settings to see
> if I can minimize them
>
Hello Kim,
Try Yoshimi. ZASFX is notorious for generating xruns.
> current settings: RT=true; Priority: 89; Frames: 1024; SR: 44kHz,
> Periods/Buffer: 3; and my latency is 69.7mS
>
89 is too high, it's better to run JACK with a prio around 70. Now
JACK's watchdog thread I running prio 99 which might cause problems with
other processes running that prio.
> -- I'm using the 2.6.36-3.dmz.2-liquorix-686 kernel
> ---------------------------------------------------------------
> -- another weird anomaly is that I get clicks from the zynaddsubfx synth
> engine when pressing more than one or two keys at once or when going
> from one key to another -- mostly heard on pads...this happens
> intermittently and doesn't happen all the time
>
Yoshimi doesn't suffer from this issue either.
> settings in my limits.conf file:
> ==================================
>
> /etc/security/limits.conf
> @kim - rtprio 99
> @kim - memlock unlimited
>
>
>
> settings in my audio.conf file:
> ================================
>
> /etc/security/limits.d/audio.conf
> the same parameters are # commented out in the 'audio.conf' file
>
> do they need to be uncommented out?
> not sure why there exist two places and whether having one location is
> sufficient...?
>
They should be commented out in your /etc/security/limits.conf file (or
don't exist at all in that file) but exist in your
/etc/security/limits.d/audio.conf file.
The lines used to get added to the limits.conf file but recently a lot
of distro's moved to adding them to the audio.conf file.
>
> is there a thread or page where Jackd optimization is discussed in detail?
> I've read the Jack FAQ http://jackaudio.org/faq
>
> but it would be helpful if there was something outlining how to adjust
> all the various params to minimize xruns for various work environments...
JACK parameters alone won't help you set up an xrun free audio
environment, it takes some more:
http://wiki.linuxmusicians.com/doku.php?id=system_configuration (that
wiki page is continously being updated, so if it contains any errors
please let me know)
Best,
Jeremy
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Received on Thu Feb 3 00:15:04 2011
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