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    SubjectRe: Ktimer / -rt9 (+custom) monotonic_clock going backwards.


    On Wed, 19 Oct 2005, Daniel Walker wrote:

    > On Wed, 19 Oct 2005, Steven Rostedt wrote:
    >
    > >
    > > Hi Thomas,
    > >
    > > I switched my custom kernel timer to use the ktimers with the prio of -1
    > > as you mentioned to me offline. I set up the timer to be monotonic and
    > > have a requirement that the returned time is always greater or equal to
    > > the last time returned from do_get_ktime_mono.
    > >
    > > Now here's the results that I got between two calls of do_get_ktime_mono
    > >
    > > 358.069795728 secs then later 355.981483177. Should this ever happen?
    >
    > Are you running NTP ?
    >

    Yes, but that shouldn't make a difference. NTP can slow down or speed up
    the clock, but it should never make it go backwards. Especially for a
    monotonic clock (as the name suggests).

    -- Steve

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