Hey,
I intend to pull the rtirq package [1] back into this decade and
realized there's a discrepancy between the priorities of JACK and
PipeWire realtime threads.
JACK's is at 60, per the decision made in Fedora 17 [2]:
```
$ ps -p 109009 -Lo tid,class,pri,rtprio,command
TID CLS PRI RTPRIO COMMAND
109009 TS 19 - jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2
109023 TS 19 - jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2
109024 TS 19 - jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2
109025 FF 60 20 jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2
109026 TS 19 - jackd --realtime -dalsa -dhw:0 -r48000 -p512 -n2
```
Accordingly, the jackuser group rtprio limit is set to 70:
```
# /etc/security/limits.d/95-jack.conf
@jackuser - rtprio 70
@jackuser - memlock 4194304
@pulse-rt - rtprio 20
@pulse-rt - nice -20
```
On the other hand, PipeWire's realtime thread runs with prio 88:
```
$ ps -p 4453 -Lo tid,class,pri,rtprio,command
TID CLS PRI RTPRIO COMMAND
4453 TS 30 - /usr/bin/pipewire
4460 FF 128 88 /usr/bin/pipewire
```
And the group gets an rtprio limit of 95:
```
# /etc/security/limits.d/25-pw-rlimits.conf
@pipewire - rtprio 95
@pipewire - nice -19
@pipewire - memlock 4194304
```
Is there a reason for this discrepancy? Apart from the already mentioned
email acknowledging the policy change in Fedora 17 [2], I couldn't find
anything else about that. Since both Pipewire and JACK fill similar
roles, I would have expected them to both have similar rtprio values.
I've also posted this to Ask Fedora [3].
Best regards,
Patrice
[1] https://src.fedoraproject.org/rpms/rtirq
[2] https://cm-mail.stanford.edu/pipermail/planetccrma/2012-May/018018.html
[3] https://discussion.fedoraproject.org/t/105188
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