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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.

    you could try the LPPTEST kernel driver and testlpp utility i integrated
    into the -RT patchset. It avoids target-side latencies almost
    completely. Especially since you had problems with parallel interrupts
    you should give it a go and compare the results.

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