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chrt: failed to set pid policy: Operation not permitted

Rado Buransky

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$ 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


Edited by Rado Buransky
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