[LAU] realtime priority - FIFO vs Round Robin and scheduling

hi Linux audio community! i've been strugling with XRUNS and glitches on a machine using Renoise, SuperCollider and Processing. i wrote a question also on Renoise forum, but everything boils down to this: Renoise seems to be running some threads with FIFO scheduler with a priority that is _below_ that of JACK and firewire driver (correct right?), but ALSO some threads using Round Robin scheduler with VERY HIGH RT priority of 95. my question is if this is a possible cause for glitches and XRUNS? the priority of 95 is above realtime clock (RTC) and firewire irq! i wonder if Round Robin scheduler isn't somewhat less stressful for the system and FIFO threads would still have priority? PRI RTPRIO CLS PID NI CMD 135 95 RR 2255 - renoise 135 95 RR 2255 - renoise 130 90 FF 114 - [irq/8-rtc0] 125 85 FF 200 - [irq/20-firewire] 106 66 FF 2583 - jackd -R -P 60 -d firewire -r 44100 -p 128 -n 3 so i'm asking Renoise guys if they know anything about it. to test, is there a way to start a process and force to use different scheduler AND/OR change priority? chrt reports Renoise is using SCHED_OTHER. any ideas greatly appreciated. the full forum post (with more data) is here: http://forum.renoise.com/index.php/topic/47767-linux-priority-too-high/ best, Luka -- Luka Prinčič / Nova deViator // + 386-40-66-77-98 / http://deviator.si / - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27·may Interface Fractures III:SILICON | In/Visible Cities, Gorizia, IT 31·may Turns Me On EP & VIDEO release | http://patreon.com/novadeviator 01·jun Koordinate Zvoka | Pritličje | Ljubljana·SI · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · OUT NOW! *Wanda & Nova deViator: Recursion EP (free DL & video)* http://wndv.bandcamp.com/album/recursion-ep https://youtu.be/4D2cTyAmj0k · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · MORE MUSIC: http://novadeviator.bandcamp.com SUBSCRIBE: http://nova.deviator.si/follow PATREON: http://patreon.com/novadeviator MORE: http://wndv.si | http://kamizdat.si | http://emanat.si · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · gpg key: http://pgp.mit.edu/pks/lookup?op=get&search=0x1397C721FFA52FD7 · · The great moral question of the twenty-first century is this: if all knowledge, all culture, all art, all useful information can be costlessly given to everyone at the same price that it is given to anyone; if everyone can have everything, anywhere, all the time, why is it ever moral to exclude anyone? -- Eben Moglen - -