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Update RTThreadPriority.md

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Robin Davies
2023-04-28 00:37:34 -04:00
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The TooB Convolution Reverb and TooB Cab IR effects require realtime scheduling to be enabled for the current user
in order process convolution data on background threads while audio is running in realtime.
The procedure for enabling realtime scheduling varies between various Linux distributions. There are two ways to enable realtime scheduling:
using native Linux scheduler calls; or using the RTKIT DBus service.
The procedure for enabling realtime scheduling varies between Linux distributions.
Most modern distributions have an RTKIT DBus service. But the restrictions imposed by the RTKIT DBus service may prevent the TooB plugins from
starting up realtime threads. RTKIT does have some configuration options, but the procedure for configuring RTKIT is unusually difficult. If
the TooB plugins exceed the limits imposed by RTKIT, the easier solution is to configure realtime permissions for the Linux native scheduler.
Most modern distributions have the RTKIT DBus service, which allow programs to request realtime priority. But the restrictions imposed by the RTKIT
DBus service may prevent the TooB plugins from starting. RTKIT does have configuration options, but the procedure for configuring RTKIT is unusually difficult.
If TooB plugins exceed the limits imposed by RTKIT (or if the RTKIT service doesn't exist), the easiest solution is to grant realtime scheduling permissions to
the current user.
The native Linux scheduler calls require the user to have appropriate permissions. To grant permissions for the TooB plugins, make the following
modifications to your system.
modifications to your system.
...
On many Linux distros, any user of the audio group is granted realtime scheduling permissions. Check for files in the `/etc/limits.d/` directory named nn-audio.conf.
If such a file exists, open it to see which group has been granted permissions. There should be a lime simular to the following:
```
@audio - rtprio 95
```
If the file exists, add your user-id to the audio group, and reboot to make the change take effect.
To grant realtime scheduling permissions to your user-id , add the following line to `/etc/security/limits.conf`:
```
youruserid - rtprio 95
```
or add the following line to grant realtime scheduling permissions for all users:
```
* - rtprio 95
```
Once you have made the change, reboot to make the change take effect.