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    SubjectRe: PREEMPT_RT vs I-PIPE: the numbers, part 2

    Kristian Benoit wrote:
    > [...]
    > Your analysis is correct, but with 600,000 samples, it is possible that
    > we got 2 peeks (perhaps not maximum), one on the logger and one on the
    > target. So in my point of view, the maximum value is probably somewhere
    > between 55us / 2 and 55us - 7us. And probably closer to 55us / 2.

    I could provide some help here, by providing the schematics and firmware
    for having a microcontroller do the pulse timing part. The schematics
    should be extremely simple, and easy to build in a breadboard (no
    soldering required) with standard parts from electronics resellers.

    With a hardware solution we could measure the *actual* target latency
    with sub-microsecond accuracy, and do some fun stuff too, like
    triggering the pulse at random intervals in a given range, etc.

    The microcontroller would then connect to the logger (or the HOST in
    your setup, and avoid an extra computer) through a serial port to report
    the measurements.

    Is this something that could be useful, or do you think this is just

    Paulo Marques -

    It is a mistake to think you can solve any major problems
    just with potatoes.
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