From owner-freebsd-questions@FreeBSD.ORG Tue Nov 29 03:43:37 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1FE5616A41F for ; Tue, 29 Nov 2005 03:43:37 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from pi.codefab.com (pi.codefab.com [199.103.21.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7DAB943D45 for ; Tue, 29 Nov 2005 03:43:36 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from localhost (localhost [127.0.0.1]) by pi.codefab.com (Postfix) with ESMTP id B23085F50; Mon, 28 Nov 2005 22:43:35 -0500 (EST) Received: from pi.codefab.com ([127.0.0.1]) by localhost (pi.codefab.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 92522-04; Mon, 28 Nov 2005 22:43:35 -0500 (EST) Received: from [192.168.1.3] (pool-68-161-122-227.ny325.east.verizon.net [68.161.122.227]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pi.codefab.com (Postfix) with ESMTP id 7BC635D20; Mon, 28 Nov 2005 22:43:34 -0500 (EST) Message-ID: <438BCE68.10601@mac.com> Date: Mon, 28 Nov 2005 22:43:36 -0500 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Vizion References: <20051128234053.GA75541@ns2.wananchi.com> <200511281549.38757.vizion@vizion.occoxmail.com> <20051129005948.P69275@chylonia.3miasto.net> <200511281608.56425.vizion@vizion.occoxmail.com> In-Reply-To: <200511281608.56425.vizion@vizion.occoxmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: amavisd-new at codefab.com Cc: Wojciech Puchar , freebsd-questions@freebsd.org Subject: Re: system time "slowing down" ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Nov 2005 03:43:37 -0000 Vizion wrote: > On Monday 28 November 2005 16:00, Wojciech Puchar: [ ... ] >>> Why not synchronize by running ntpd? >> >> or rdate? > > sure if you know the host you are using as a reference is itself reliably > referenced! There's nothing wrong with rdate, but the NTPv4 protocol includes tests and detection measures for broken clocks which eliminate most "falsetickers". Running ntpd will try to generate an ntp.drift file which will compensate for the drift of the native clock, so if the problematic system is off by a consistent factor, ntpd can compensate for that, within limits. On the other hand, if the drift is variable or the clock hardware is just completely busted, then I'd replace the motherboard, or at least break apart the system and look for bad solder joints, leaky caps, etc, and try reconnecting everything again.... -- -Chuck