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    SubjectRe: PREEMPT_RT vs I-PIPE: the numbers, part 2
    On Wed, Jun 22, 2005 at 01:20:03PM -0400, Kristian Benoit wrote:
    > On Wed, 2005-06-22 at 09:27 -0700, Paul E. McKenney wrote:
    > > On Wed, Jun 22, 2005 at 11:31:39AM -0400, Karim Yaghmour wrote:
    > >
    > > If I understand your analysis correctly (hah!!!), your breakdown
    > > of the maximum delay assumes that the maximum delays for the logger
    > > and the target are correlated. What causes this correlation?
    > > My (probably hopelessly naive) assumption would be that there would
    > > be no such correlation. In absence of correlation, one might
    > > approximate the maximum ipipe delay by subtracting the -average-
    > > ipipe delay from the maximum preemption delay, for 55us - 7us = 48us.
    > > Is this the case, or am I missing something here?
    > 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.

    Possible, but it could also be a large peak and a small one.

    Any way of getting the logger's latency separately? Or the target's?

    Thanx, Paul
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