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

[Steven Rostedt <rostedt@goodmis.org>]

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/