Hi - What are your experiences of xruns with the current beta?
I'm currently running jackd+scvim on latest broth on an Eee 904HD, using the default p:d kernel (2.6.31-5-pure) and default jack settings (block size 1024, rt, etc). Running a really simple patch (just a bit of white noise) I get audible+reported xruns with a suspicious regularity, they all occur when the number of seconds on the clock ends in "2" (2.3, 12.3, 22.3, 32.3, 42.3, 52.3) - there must be an irq every ten seconds that has the ability to get in the way. I notice that jackd is running at a high-ish priority (20) but not as high (70) as recommended by Flo Shmidt: http://tapas.affenbande.org/wordpress/?page_id=40 The priority of 20 probably isn't high enough since various things also run at that level (eg Xorg). I'm not sure which is my soundcard's IRQ but that should also be higher than the others for smooth rt audio. To be honest I normally start jackd from a script, but I'm doing it from qjackctl here because I expect that'll be how an "ordinary user" (ho ho) will get at it. qjackctl doesn't seem to have a config option for jackd's "-P" option. When running jackd from CLI and with "-P 70" I don't seem to get xruns (although I don't actually get a priority of 70, according to top). I found I can hack it by adding " -P 70" to the end of qjackctl's "Server Path" option. This gets stored in ~/.config/rncbc.org/QjackCtl.conf and in ~/.jackdrc. The latter file is present in skel but it's not sufficient to make the option stick if you just do it there. It looks like it works to have a simple two-line barebones config file /etc/skel/.config/rncbc.org/QjackCtl.conf containing the following: [Settings] Server=/usr/bin/jackd -P 70 This seems to give a good default priority on first launch of qjackctl, eliminating xruns in my simple test on one machine. What do people think? Dan -- http://www.mcld.co.uk _______________________________________________ Mailing list: https://launchpad.net/~puredyne-team Post to : [email protected] Unsubscribe : https://launchpad.net/~puredyne-team More help : https://help.launchpad.net/ListHelp
