From: Steven Rostedt <rostedt@goodmis.org>
To: Daniel Walker <dwalker@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards.
Date: Thu, 20 Oct 2005 02:39:55 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.58.0510200238390.27683@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.64.0510190816380.30406@dhcp153.mvista.com>
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
next prev parent reply other threads:[~2005-10-20 6:40 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-19 14:59 Steven Rostedt
2005-10-19 15:10 ` Thomas Gleixner
2005-10-19 18:39 ` john stultz
2005-10-20 6:55 ` Steven Rostedt
2005-10-20 7:34 ` Ingo Molnar
2005-10-20 7:46 ` Steven Rostedt
2005-10-20 8:01 ` Ingo Molnar
2005-10-20 8:56 ` Steven Rostedt
2005-10-20 8:59 ` Ingo Molnar
2005-10-20 9:04 ` Steven Rostedt
2005-10-20 9:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 10:05 ` Steven Rostedt
2005-10-20 15:55 ` Ingo Molnar
2005-10-20 16:09 ` Steven Rostedt
2005-10-20 16:45 ` john stultz
2005-10-20 16:58 ` Steven Rostedt
2005-10-20 17:05 ` john stultz
2005-10-20 19:32 ` Ingo Molnar
2005-10-20 20:05 ` john stultz
2005-10-20 20:54 ` Ingo Molnar
2005-10-21 6:03 ` Steven Rostedt
2005-10-21 7:49 ` Thomas Gleixner
2005-10-21 7:57 ` Steven Rostedt
2005-10-21 8:00 ` ktimer API Steven Rostedt
2005-10-21 8:09 ` Thomas Gleixner
2005-10-21 18:09 ` Ktimer / -rt9 (+custom) monotonic_clock going backwards john stultz
2005-10-21 18:15 ` Thomas Gleixner
2005-10-20 22:06 ` George Anzinger
2005-10-20 6:19 ` Steven Rostedt
2005-10-20 14:34 ` Steven Rostedt
2005-10-20 15:18 ` Steven Rostedt
2005-10-20 15:23 ` Steven Rostedt
2005-10-20 16:01 ` Steven Rostedt
2005-10-19 15:11 ` Ingo Molnar
2005-10-20 6:38 ` Steven Rostedt
2005-10-20 6:56 ` Ingo Molnar
2005-10-19 15:21 ` Daniel Walker
2005-10-20 6:39 ` Steven Rostedt [this message]
2005-10-20 15:02 ` Daniel Walker
2005-10-20 22:19 ` George Anzinger
2005-10-20 23:23 ` john stultz
2005-10-19 16:44 ` Frank Sorenson
2005-10-20 6:43 ` Steven Rostedt
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