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What's the overhead of task switching under RT-Linux?

Jianjun Liu
Intellectual 945 points
Other Parts Discussed in Thread: AM3517

Hi,

  One AM3517 customer has a cirtical timing request of their ADC/DAC controlling/sampling board. They need to have 3 interrupts per ms. They want to know the feasibility on this under RT-Linux.  Besides the controlling/sampling process, the other task is network data transferring.

  Thanks for sharing.

 

Br, Jianjun

 

  • 0
    TI__Intellectual 1430 points

    Hello,

    Typical latencies with RT Linux on Sitara platform are around 300usecs. This is measured using the cyclictest tool. Cyclictest measures the amount of time that passes between when a timer expires and when the thread which set the timer actually runs. Though not a direct analogy to a hardware interrupt and software servicing of that interrupt, cyclictest will give you a rough idea of the latencies involved in the system.

    Thanks,

    Ranjith

  • 0 in reply to Ranjith Lohithakshan
    TI__Intellectual 1155 points
    Hi Ranjith
    Thank you.
    BTW, I found little documents or resource on RTLinux of DM/AM37 & AM3517.
    Could you please help share something with me or update the status? I realy am not clear about the status of RTLinux.