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 > -- > _______________________________________________ > devel mailing list -- devel@lists.fedoraproject.org > To unsubscribe send an email to devel-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org > Do not reply to spam, report it: > https://pagure.io/fedora-infrastructure/new_issue >
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