[PD] glitches when streaming UDP

Dan Wilcox danomatika at gmail.com
Tue Jan 30 23:21:33 CET 2018

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.

> 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 <mailto:reduzent at gmail.com>>
> To: Pd-List <pd-list at lists.iem.at <mailto:pd-list at lists.iem.at>>
> Subject: Re: [PD] glitches when streaming UDP
> Message-ID: <1517343926.2187.14.camel at gmail.com <mailto: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 <http://twitter.com/danomatika>
danomatika.com <http://danomatika.com/>
robotcowboy.com <http://robotcowboy.com/>

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