SCHED_RR on agx orin

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
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jp6.2 agx orin

如何使用 SCHED_RR scheduling，有没有什么文档或者资料

我们尝试在agx orin上修改运行程序的调度策略：为SCHED_RR，修改线程的nice值，没有成功，但在PC的ubuntu系统是能正常操作的。

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*** Please note that this reply is generated by LLM automatically ***

The question seems to be asking about the scheduling policy on the Jetson AGX Orin module, specifically the SCHED_RR scheduling policy, and how it relates to the nice priority and the Ubuntu operating system.

According to the Linux kernel documentation, SCHED_RR is a real-time scheduling policy that is designed for applications that require predictable and low-latency responses. It is a priority-based scheduling policy, where tasks with higher priorities are executed before tasks with lower priorities.

On the Jetson AGX Orin module, the SCHED_RR scheduling policy is supported, and it can be used to schedule tasks with specific priorities. The nice priority is a way to adjust the priority of a task, with lower values indicating higher priorities.

In Ubuntu, which is the operating system used on the Jetson AGX Orin module, the nice priority is used to adjust the priority of tasks. The nice value ranges from -20 (highest priority) to 19 (lowest priority).

To answer the question, here is a comparison of the SCHED_RR scheduling policy on the Jetson AGX Orin module and the nice priority in Ubuntu:

  • SCHED_RR scheduling policy:
    • Priority-based scheduling policy
    • Tasks with higher priorities are executed before tasks with lower priorities
    • Supported on the Jetson AGX Orin module
  • nice priority in Ubuntu:
    • Adjusts the priority of tasks
    • Lower values indicate higher priorities
    • Range: -20 (highest priority) to 19 (lowest priority)

In summary, the SCHED_RR scheduling policy on the Jetson AGX Orin module is a priority-based scheduling policy that is designed for real-time applications, while the nice priority in Ubuntu is a way to adjust the priority of tasks. The two are related in that the nice priority can be used to adjust the priority of tasks that are scheduled using the SCHED_RR scheduling policy.

It’s worth noting that the Jetson AGX Orin module also supports other scheduling policies, such as SCHED_FIFO and SCHED_OTHER, which have different characteristics and use cases. Additionally, the Jetson Linux Developer Guide provides more information on the scheduling policies and how to use them on the Jetson AGX Orin module.

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SCHED_RR调度必须在real-time kernel(实时内核)上运行吗？

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Hi,
Please try RT kernel. A user mentions it works in RT kernel:
SCHED_RR on AGX Orin fails with Operation Not Permitted

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