I keep seeing the following message in my Ardour log after loading a session:
[INFO]: Cannot set I/O Priority for disk read/write thread
As I have set all of the recommended entries in /etc/security/limits.conf I am not sure what else can be done. This is on an Ubuntu based system, running kernel 6.17.0-14-generic and Ardour 9.2.0…
It’s not a warning, just an info message. Prioritizing disk I/O over other application’s disk i/o is not usually needed.
You can safely ignore it unless you’re on a system with
- slow disks (e.g. USB2 spinning external HDDs)
- run other disk I/O intensive processes in addition to Ardour
- …and use a few hundred tracks in Ardour.
That being said, to allow a process to elevate disk I/O priority CAP_SYS_ADMIN capabilities are required:
sudo setcap cap_sys_admin+ep /opt/Ardour-9.2.0/bin/ardour-9.2.0
For more information search for SYS_ioprio_set IOPRIO_CLASS_RT.
Thank you, the information is appreciated.