[pulseaudio-discuss] System-wide PulseAudio instance with realtime priority as non-root from systemd

Jürgen Herrmann t-5 at t-5.eu
Sat Oct 31 12:44:19 UTC 2020

What happens if you start the pulseaudio daemon in the console? Do you get 
rt scheduling then? I would check that first to see if pulsesudio is 
configured correctly. If that works you're probably better off asking the 
question in the systemd list then...

Best regards, Jürgen

Am 31. Oktober 2020 01:33:05 schrieb Matt Garman <matthew.garman at gmail.com>:

> It appears it was a systemd config issue, rather than an issue with
> pulse.  In addition to updating /etc/security/limits.conf, I also
> needed to add the following to the [Service] stanza in my pulseaudio
> service file:
> LimitRTPRIO=95
> LimitNICE=-19
> But I still cannot get realtime (fifo) scheduling to work.  I
> additionally have this in my Service stanza:
> CPUSchedulingPolicy=fifo
> And this in /etc/pulse/daemon.conf:
> realtime-scheduling = yes
> But still not getting realtime priority:
> # chrt -p `pgrep pulseaudio`
> pid 1203's current scheduling policy: SCHED_OTHER
> pid 1203's current scheduling priority: 0
> Thanks!
> On Fri, Oct 30, 2020 at 5:35 PM Matt Garman <matthew.garman at gmail.com> wrote:
>> On Fri, Oct 30, 2020 at 5:17 PM Jürgen Herrmann <t-5 at t-5.eu> wrote:
>> > Look here: 
>> https://t-5.eu/hp/Software/Pulseaudio%20Crossover%20Rack/OnlineHelp/#scheduling
>> Hi Jürgen, thank you for the quick reply.  But either I'm missing
>> something, or that says to do exactly what I've already done..
>> Realtime scheduling works when run from the commandline using
>> "runuser" (i.e. so I don't run as root).  But when launched from
>> systemd, setting the realtime priority fails (setrlimit() operation
>> not permitted).
>> Thanks again,
>> Matt
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Mit Aqua Mail Android
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