Linux Kernel - Kernel-rt

Kernel-rt kernel is a special Linux kernel that is designed to provide real-time operation (RV). Kernel-rt includes stricter rules for scheduling and resource management to minimize latency and jitter, which is often critical for systems like automatic control systems, medical equipment, etc.

Kernel-rt contains a preempt_rt patch that allows the Linux kernel to quickly switch between tasks and perform them with minimal delays. The preempt_rt patch contains an implementation of the event waiting method (Futexes), which provides interprocess communication with much lower delays than in standard Linux kernels.

What is the core for?

The Linux Kernel is the software that is the basis of the Linux operating system. It provides an interface between hardware and applications, manages memory, processes, file system and other aspects of the operating system.

Kernel-rt (Real Time) is a special version of the Linux kernel that provides more accurate and predictable management of operating system processes. It is used in tasks requiring high speed and reactivity, such as automation of production processes, telecommunications, robot control systems and many others.

Kernel-rt also provides improved compatibility with real-time applications, such as real-time multitasking operating systems (RTOS), which are used in automation controllers and other control systems.

Advantages of Kernel-rt Kernels

1. Provides minimal delays and jitter in real-time operation of the system.
2. Allows you to more accurately manage system resources and their use.
3. Supports most modern hardware platforms and devices.
4. Allows you to improve the performance of the system as a whole.

It should be noted that using the Kernel-rt kernel may require additional knowledge and experience in configuring the operating system, so its use is usually limited to experts and developers who specialize in real-time systems.

Disadvantages of Kernel-rt kernels

Kernel-rt kernels have their drawbacks:

1. The need for additional configuration and experience - requires more complex configuration and verification, since its use in real time is extremely sensitive to settings and configuration.
2. Hardware Restrictions - may not be supported by some hardware, especially outdated or rare.
3. Usage Restrictions - Configured for real-time operation and may not be suitable for other tasks such as program development and debugging.
4. Deterioration of multitasking - due to increased real-time operation, the Kernel-rt core may be less efficient in processing multiple tasks simultaneously.
5. Unpredictability - the kernel is able to reduce delays and jitter in the operation of the system, it still may not guarantee their complete absence. In some cases, this may be critical, for example, when working with high-frequency applications.

Using the Kernel-rt kernel requires careful study of its features, advantages and limitations in order to make the right choice when developing real-time systems.