From owner-freebsd-current@FreeBSD.ORG  Wed Mar  1 22:16:01 2006
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@freebsd.org
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 6BAD416A420;
	Wed,  1 Mar 2006 22:16:01 +0000 (GMT)
	(envelope-from phk@critter.freebsd.dk)
Received: from pasmtp.tele.dk (pasmtp.tele.dk [193.162.159.95])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 117F443D45;
	Wed,  1 Mar 2006 22:16:00 +0000 (GMT)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (0x535c0e2a.sgnxx1.adsl-dhcp.tele.dk
	[83.92.14.42]) by pasmtp.tele.dk (Postfix) with ESMTP id D978B1EC303;
	Wed,  1 Mar 2006 23:15:59 +0100 (CET)
Received: from critter.freebsd.dk (localhost [127.0.0.1])
	by critter.freebsd.dk (8.13.4/8.13.4) with ESMTP id k21MFwaq014295;
	Wed, 1 Mar 2006 22:15:59 GMT (envelope-from phk@critter.freebsd.dk)
To: Mike Jakubik <mikej@rogers.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Wed, 01 Mar 2006 17:06:52 EST."
	<44061AFC.4080109@rogers.com> 
Date: Wed, 01 Mar 2006 22:15:58 +0000
Message-ID: <14294.1141251358@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
Cc: freebsd-current@freebsd.org
Subject: Re: Still seeing "calcru: runtime went backwards" messages 
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 01 Mar 2006 22:16:01 -0000

In message <44061AFC.4080109@rogers.com>, Mike Jakubik writes:


>Mar  1 17:04:27 fbsd kernel: calcru: runtime went backwards from 6995 
>usec to 6994 usec for pid 662 (perl)

Backwards steps of this small nature are to be expected from the
cpu_tick (TSC) calibration in kern_tc.c

It is possible that they can be eliminated with a more precise (and
therefore timeconsuming) calibration calculation.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.