Rado Buransky

After hours of trying I found this solution: I wasn't able to set the kernel variable using armbian-config but I created new file "/etc/sysctl.d/50-my-app.conf" and added "kernel.sched_rt_runtime_us=-1" to it. Rebooted and it works.

$ stress -c 1 -t 60 & [1] 2578 $ sudo chrt -r -p 95 2578 chrt: failed to set pid 2578's policy: Operation not permitted Why this doesn't work? My actual problem is that Jack Audio can't use real-time scheduling, but this example should demonstrate that there is a general problem probably. (getting ERROR: Cannot use real-time scheduling (RR/10) (1: Operation not permitted), ERROR: AcquireSelfRealTime error) $ uname -a Linux odroidc2 6.6.16-current-meson64 #1 SMP PREEMPT Mon Feb 5 20:14:39 UTC 2024 aarch64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Armbian 24.2.1 bookworm Release: 12 Codename: bookworm