I think the main reason is that I was not aware of this policy and so we
chose some random numbers. The parameters are configurable at build time
and I can add these limits.
Wim
On Wed, Feb 14, 2024 at 7:30 PM Runiq via devel <
devel@lists.fedoraproject.org> wrote:
> 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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