This page is not about one microcontroller in particular, but any that run embedded Linux.
PREEMPT_RT is a Linux mod that changes the Kernal to make it more deterministic. With the proper settings, it gives a worst-case delay of single-figure microseconds (still much higher than a dedicated microcontroller, that can have worst-case interrupt delays in the 10-100’s of nanoseconds).
There are four main performance-improvement aspects of embedded Linux:
- Linux with real-time extensions (e.g. the PREEMPT_RT patch)
- Multicore vertical partitioning with core isolation augmented by a light-weight threading (LWT) model
- Virtualization techniques that are based on real-time kernel accelerator engines
- The event machine model for scalable and dynamic load balancing in a multicore device
The RTwiki, a real-time Linux wiki.