From owner-freebsd-stable@FreeBSD.ORG Mon Jul 23 19:48:25 2007 Return-Path: Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F205B16A41A for ; Mon, 23 Jul 2007 19:48:25 +0000 (UTC) (envelope-from jdc@parodius.com) Received: from mx01.sc1.parodius.com (mx01.sc1.parodius.com [72.20.106.3]) by mx1.freebsd.org (Postfix) with ESMTP id EBE7513C461 for ; Mon, 23 Jul 2007 19:48:25 +0000 (UTC) (envelope-from jdc@parodius.com) Received: by mx01.sc1.parodius.com (Postfix, from userid 1000) id 9F6301CC050; Mon, 23 Jul 2007 12:48:25 -0700 (PDT) Date: Mon, 23 Jul 2007 12:48:25 -0700 From: Jeremy Chadwick To: Chuck Swiger Message-ID: <20070723194825.GA56511@eos.sc1.parodius.com> Mail-Followup-To: Chuck Swiger , freebsd-stable@FreeBSD.ORG, LoN_Kamikaze@gmx.de References: <200707231410.l6NEA6Do034748@lurza.secnetix.de> <9CF2C133-3EAF-4E75-A9DA-5366CD0535BF@mac.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9CF2C133-3EAF-4E75-A9DA-5366CD0535BF@mac.com> User-Agent: Mutt/1.5.15 (2007-04-06) Cc: LoN_Kamikaze@gmx.de, freebsd-stable@FreeBSD.ORG Subject: Re: ntpd just sits there and does nothing X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jul 2007 19:48:26 -0000 On Mon, Jul 23, 2007 at 12:18:59PM -0700, Chuck Swiger wrote: > No machine should ever poll faster than once a minute (aka "minpoll 8") to > someone else's timeserver without prior agreement. For an example of a > reasonable client config, MacOS X uses a minpoll of 12 and a maxpoll of 17. And an addendum to this: Our servers use "maxpoll 9" for a very specific reason: it appears to work around an issue where on FreeBSD ntpd continually flips between PLL and FLL mode. The default for maxpoll is 10 (1024 seconds). Taken from our ntp.conf is this comment: # maxpoll 9 is used to work around PLL/FLL flipping, which # happens at exactly 1024 seconds (the default maxpoll value). # Another FreeBSD member recommended using 9 instead. # http://lists.freebsd.org/pipermail/freebsd-stable/2006-December/031512.html -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |