I have a problem that seems to be quite low level:
I run Ubuntu20.04 as delivered by Tuxedo Computers with the Ubuntu Studio Extensions(Kernel, setup etc)
I use the Soundcraft Notepad-12 FX Mixer as a USB Interface, works perfectly well OOTB.
Its a capable machine (AMD Ryzen 9 PRO 3900 12-Core Processor, 32G RAM) so I can do a lot without any xruns at settings for <10ms latency, CPU Gov is Performance.
BUT: from time to time, without running large plugins or Ardour projects I get tons of xruns(thousands per second) and dropouts in the whole sound system.
The only info, that may be related from top is:
Code: Select all
444 root -77 0 0 0 0 R 86,0 0,0 666:31.72 irq/98-xhci_hcd
Code: Select all
3081 zettber+ 20 0 163360 86908 86024 S 79,7 0,3 437:38.78 zita-a2j
45118 zettber+ 20 0 2394832 520216 235744 S 20,6 1,6 229:44.27 carla
394 root -86 0 0 0 0 S 6,0 0,0 179:16.93 irq/55-xhci_hcd
2085 root 20 0 24,2g 119160 71912 S 4,3 0,4 140:59.18 Xorg
2543 zettber+ 9 -11 3091360 106240 100584 S 3,3 0,3 53:51.71 pulseaudio
2685 zettber+ 20 0 3109464 208108 117276 S 3,3 0,6 31:38.16 kwin_x11
3034 zettber+ 20 0 250404 96892 89040 S 2,0 0,3 34:18.73 jackdbus
BTW: I use to have Carla running 24/7 with a light setup of Guitarix and CALF Limiter as a allways on Guitar amp, and not xruns ever, after several days of use...
But when I demand some more and with Synths/MIDI it takes only minutes to a rain of xruns... even with the synths unused running in the background...