Re: [Jackaudio] Jack & systemd on RPI4

Hi Phil, On 2020-05-12 20:37:40 (+0200), pfl wrote: Yeah, running a **system** service as a user (using the `User=` directive) might also work, as long as you get the required directories in line. Have a look at the realtime related settings in the upstream user service [1]. They are also applicable to **system** services and basically allow your service to use realtime scheduling priority of up to 95. Otherwise any service either defaults to a setting from its parent or the system-wide default (set by your distribution). To read more about those settings, have a look at the upstream systemd.exec documentation [2]. Note, that for an unprivileged user you have to allow said user to use a specific realtime scheduling priority (e.g. 95) and unlimited memlock. On Arch Linux we have started making this available via the `realtime` user group [3] (on other distributions it's sometimes coupled to the `audio` group) by installing a configuration drop-in to /etc/security/limits.d/. However, this can also be set for your specific user only (see /etc/security/limits.conf for the syntax). Best, David [1] https://github.com/jackaudio/jack2/blob/develop/systemd/jack%40.service.in#… [2] https://www.freedesktop.org/software/systemd/man/systemd.exec.html#Process%… [3] https://git.archlinux.org/svntogit/community.git/tree/trunk/99-realtime-pri…