[LAU] FW: jackd -r | PD -rt

[W. Ryan Nestor]

From: w_r_nestor at hotmail.com
To: linux-audio-user at lists.linuxaudio.org
Subject: jackd -r | PD -rt
Date: Sun, 2 Mar 2008 20:45:32 -0500








Hi All,
   I'm new to the list and I have a lot to learn from you all I am sure.   I've been pursuing and open-source audio studio for a while now, and I am almost there.  I'm running a G3/500mhz 'pismo' powerbook with eho audio's  Layla24.

    My question today involves PureData and jack.  Some background first.  I have had success compiling a custom rt patched kernel 2.6.23.1-rt11, as well as the neewest kernel.  I have set up PAM  to allow realtime privileges to  my user and groups in /etc/security/limits.conf.  I've also changed the priority of softirg- stuff to 99 with chrt.

   As far as I know, all this should give a working non-root realtime system.  My problem comes when working In my main environment: PD.  I am working with the snd-layla24 driver and qjackctl.  I've been able to get jack running with -R enabled.  However, when I launce pd with the -rt flag, I get horrible A/D/A sync issues resulting in *UNINTENTIONAL* crackles and pops (as opposed to the intentional ones I'll make as soon as this is running).  Worst of all, there are no Xruns at all.  Before I messed with pam, I was getting very low latency running both jack and PD as root.  

   Does anyone have an idea for how to proceed, a idiot-proof configuration that works?  Id love to eventually get <10ms at 8ch i/o. 

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