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Documentation: configuring PiPedal for Ubuntu.

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Robin E. R. Davies
2025-02-20 13:50:10 -05:00
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docs/Configuring.md
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## Selecting a real-time kernel on Ubuntu.
This step is unneccesary on Raspberry Pi OS, which installs an RT_PREEMPT kernel by default.
By default, Ubuntu installs a PREEMT_DYNAMIC kernel, configured to run with volutary preemption. You will need to change this. You can do this by running the following command after you have installed PiPedal:
```
pipedal_kconfig
```
In order to support real-time audio processing, select Preempt=full.
An RT_PREEMPT kernel provides slightly better realtime audio than a PREEMPT_DYNAMIC/preempt=full kernel, but the PREEMPT_DYNAMIC should be perfectly adequate. If you are having problems with audio dropouts, you may want to try an RT_PREEMPT kernel instead. Ubuntu provides a pre-built RT_PREEMPT kernel; but on our test systems, you can acheive stable low-latency audio using only the PREEMPT_DYNAMIC/preempt=full kernel. The pre-build Ubuntu RT_PREEMPT
kernel is only available if yo have an Ubuntu Pro subscription. But it is relatively easy to build the Ubuntu RT_PREEMPT kernel from source. That is, however, outside the scope of this document. We recommend using the PREEMPT_DYNAMIC/preempt=full Ubuntu kernel.
## Configuring PiPedal After Installation