[PD] glitches when streaming UDP

[Roman Haefeli]

On Die, 2018-01-30 at 23:21 +0100, Dan Wilcox wrote:
> If you're using jack, is the jack server running without dropouts
> with other software? I'm only suggesting to consider sources other
> than Pd as well.

Let me stress the fact, that Pd is the only software with glitches.
There are no jackd xruns whatsoever when Pd glitches are happening.
Ardour is rock-stable with the same setup.

Roman


> 
> > On Jan 30, 2018, at 9:25 PM, pd-list-request at lists.iem.at wrote:
> > 
> > Date: Tue, 30 Jan 2018 21:25:26 +0100
> > From: Roman Haefeli <reduzent at gmail.com>
> > To: Pd-List <pd-list at lists.iem.at>
> > Subject: Re: [PD] glitches when streaming UDP
> > Message-ID: <1517343926.2187.14.camel at gmail.com>
> > Content-Type: text/plain; charset="utf-8"
> > 
> > On Die, 2018-01-30 at 16:38 +0100, Dan Wilcox wrote:
> > > Is it running with the *same* OS and settings?
> > As far as I can tell: yes. Same OS (Ubuntu 16.04), same Kernel
> > (4.13.0-
> > 32-lowlatency), both tuned so that "realtimeconfigquickscan"
> > doesn't
> > complain anymore. This includes configuring
> > /etc/security/limits.conf,
> > adding user to audio group, making high-precision timer /dev/hpet
> > und
> > realtime clock /dev/rtc readable by members of audio group, etc. I
> > get
> > stable performance with Ardour with the same qjackctl settings,
> > with
> > built-in soundcard, but also with external USB sound interface on
> > BOTH
> > machines.
> > 
> > > It might be a scheduling issue with the kernel, realtime
> > > settings,
> > > crappy networking driver, etc. 
> > I thought about that, too. But why does it affect only Pd? On the
> > "troubled" machine - where everything else runs supersmooth - this
> > setup suffers a couple of glitches per second (jack routing):
> > 
> > mpv -> Pd running [adc~]-[dac~] -> system output
> > 
> > The probable causes you mentioned would affect other audio
> > softwares,
> > too, wouldn't they? 
> > 
> > The Pd version doesn't seem to make a difference...
> > 
> > Anyway, thanks for your thoughts.
> > 
> > Roman
> --------
> Dan Wilcox
> @danomatika
> danomatika.com
> robotcowboy.com
> 
> 
> 
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