From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] Synchronising TSC and periodic timer
Date: Wed, 15 Mar 2006 14:34:41 +0100 [thread overview]
Message-ID: <17432.6129.478721.712374@domain.hid> (raw)
In-Reply-To: <4417C14A.2010900@domain.hid>
Jan Kiszka wrote:
> Likely too simple: The periodic IRQ seems to pop up on every CPU so that
> the TSC could be recorded, but will this happen synchronously? At least
> we will see (IRQ) jitters, and those jitters could already create in the
> single-CPU case a non-monotonic clock...
I do not know how this issue is solved in Linux, but there seem to be a
simple solution: before adding the tsc offset to the last tick time,
this tsc offset should be compared with the tick duration in tsc
counts; if it is greater, then replace with the tick duration in tsc.
--
Gilles Chanteperdrix.
next prev parent reply other threads:[~2006-03-15 13:34 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-14 20:45 [Xenomai-core] Synchronising TSC and periodic timer Jan Kiszka
2006-03-15 7:24 ` Jan Kiszka
[not found] ` <4417C74D.3060203@domain.hid>
2006-03-15 8:14 ` Jan Kiszka
2006-03-15 12:59 ` Philippe Gerum
2006-03-15 13:26 ` Gilles Chanteperdrix
2006-03-15 22:58 ` Philippe Gerum
2006-03-20 11:48 ` Jan Kiszka
2006-03-20 13:26 ` Philippe Gerum
2006-03-20 14:42 ` Rodrigo Rosenfeld Rosas
2006-03-20 16:51 ` Philippe Gerum
2006-03-20 19:27 ` Rodrigo Rosenfeld Rosas
2006-03-21 0:11 ` Jan Kiszka
2006-03-21 3:11 ` Rodrigo Rosenfeld Rosas
2006-03-20 14:46 ` Jan Kiszka
2006-03-21 12:44 ` Philippe Gerum
2006-03-24 13:14 ` Jan Kiszka
[not found] ` <200603201137.12548.rosenfeld@domain.hid>
2006-03-20 15:23 ` Philippe Gerum
2006-03-20 19:01 ` Rodrigo Rosenfeld Rosas
2006-03-21 17:57 ` Philippe Gerum
2006-03-15 13:34 ` Gilles Chanteperdrix [this message]
2006-03-15 16:50 ` Jan Kiszka
2006-03-16 15:26 ` Gilles Chanteperdrix
2006-03-17 1:16 ` Jan Kiszka
[not found] <1CFEB358338412458B21FAA0D78FE86D02CABF1C@rennsmail02.eu.thmulti.com>
2006-03-15 17:20 ` Jan Kiszka
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