<blockquote> Message: 2 Date: Mon, 17 Sep 2012 10:52:51 +0200 From: Thomas Orgis <thomas-forum@orgis.org> To: Ubuntu Studio Users Help and Discussion <ubuntu-studio-users@lists.ubuntu.com> Subject: Horrific jackd xrun behaviour after upgrade from US 10.04 to 12.04 Message-ID: <20120917105251.1214a1c9@orgis.org> Content-Type: text/plain; charset="us-ascii" Hi, the subject says it all ... I had an install of 10.04 that worked. Only issue seemed to be instability when recording while a USB drive is connected. So, considering that perhaps this is a sign to replace a mainboard with broken onboard USB (used a PCI add-on card, which might have worsened the interrupt situation), I did replace it and the machine worked fine during a session. Now with the fully replaced hardware (Asus AM3 board with 780G chipset, Athlon || X3 460, 8 Gig of Kingston DDR3 ValueRAM, 250 G Seagate SATA boot, 2 WD EADS on mdraid for recordings and not to forget VIA firewire on PCI-E (same card as before)) and the update to ubuntu 12.04 (yes, should have tested the final hardware with 10.04 first, eh?), the performance is hindered by jackd not being able to keep steady without generating xruns at a some rate. Not really constant rate, though, also its behaviour depends on client connections (even when just connecting meterbridge, this seems to help triggering xruns a lot). A very interesting fact is that using 3x512 periods (or bigger) is less stable even than going down to 3x32! With big periods, I get xruns right away, while with the low setting, I was able to get an hour of recording done, but that ended prematurely -- I _guess_ that this was because of some software glitch (like xrun handling) and not due to the bass player nudging the keyboard by chance. But I cannot be sure about that. Now, I do have the lowlatency kernel already installed, also fresh jack/ardour from kxstudio ... have rtirq setup updated by dpkg (firewire in there instead of ohci1394). What are the ubuntu studio folks' thoughts on this? Did you encounter _more_ stable jack with extremely low latencies? But since it is not really stable and glitch-free in any config, this interesting characteristic does not help. Oh, and it happens independent of cpufreq governor. I do use XFCE and the integrated radeon with open source driver. Any help on getting that setup stable again is appreciated ... or should I simply go back to 10.04 (and hand-install current ardour/jack, as I did before)? I figure that I shouldn't even need a lowlat kernel for getting basic 3x512 recording work! Alrighty then, Thomas. PS: Why upgrade at all? Well, I have always a spark of hope that some iteration of the GNU/Linux audio ecosystem will be really stable, without random crashes of Ardour, for example. But I guess one has to live with crashing multimedia apps ... not been that different during my days doing video with Ulead Media Studio on Windows (and the fact that version 5 was less usable than 2.5). -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 197 bytes Desc: not available URL: <https://lists.ubuntu.com/archives/ubuntu-studio-users/attachments/20120917/8b38691f/attachment-0001.pgp> ------------------------------ -- Ubuntu-Studio-users mailing list Ubuntu-Studio-users@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users End of Ubuntu-Studio-users Digest, Vol 65, Issue 11 *************************************************** </blockquote>Hello Thomas, I use KXStudio on top of UbuntuStudio, but the 12.04 version. I haven't had any of the problems you mentioned at all. You might want to post your question on linuxmusicians forum here: http://linuxmusicians.com/viewtopic.php?f=47&t=8012 I think you'll get more specific help with KXStudio there.. brian