Le Mon, 29 Jul 2013 17:46:36 -0700,
rm.ric...@jacob21819.net (Robert M. Riches Jr.) a écrit :

> > From: ???????????? ??????????????????????
> > <akhil...@gmail.com> Date: Mon, 29 Jul 2013 13:50:01 +0700
> > To: Ralf Mardorf <ralf.mard...@alice-dsl.net>
> > X-Headers-End: 1V3hHm-0005Gs-GX
> > Cc: 72-alsa <alsa-user@lists.sourceforge.net>
> >
> > you may also try alsa's loopback module
> > https://bbs.archlinux.org/viewtopic.php?pid=765075#p765075
> 
> At least with some distribution releases, the ALSA loopback
> module doesn't work well.  For example, with Mageia 1 it worked
> perfectly.  Then, with Mageia 2, it has severe xruns, both with
> net-JACK and with only aplay and arecord.  Evidence suggests the
> loopback module accepts samples too rapidly from the sending
> client, which overruns the buffer of the receiving client.

I always use my own kernel (a "normal" one, with rt enabled trough
CONFIG_RT_GROUP_SCHED (Group scheduling for SCHED_RR/FIFO, all the other
cgroup stuffs are disabled) - that way I can use that kernel for every
thing, not just audio), with the ALSA driver from that kernel (not as a
separated package), and I never got any issue with snd-aloop, which is
up and running all the time. In fact, rt is only needed if you want very
low latency with jack.

More and more distributions are using cgroups, maybe the cause of your
issue is a less audio friendly cgroup defaut setup. That's just an idea,
nothing more.

In any case, to not add latency, the period size of zita*2* must be
smaller than the period of jack, with the exception when this last one
is already very small.

Dominique
> 
> I asked here a while ago if there were solutions.  Yes, I ought
> to file a bug report if I could scrape together a few minutes to
> do so.
> 
> Robert
> 
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