From owner-freebsd-stable@FreeBSD.ORG Tue Feb 23 09:19:55 2010 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 AA986106568B for ; Tue, 23 Feb 2010 09:19:55 +0000 (UTC) (envelope-from peterjeremy@acm.org) Received: from mail12.syd.optusnet.com.au (mail12.syd.optusnet.com.au [211.29.132.193]) by mx1.freebsd.org (Postfix) with ESMTP id 35E458FC13 for ; Tue, 23 Feb 2010 09:19:54 +0000 (UTC) Received: from server.vk2pj.dyndns.org (c122-106-232-148.belrs3.nsw.optusnet.com.au [122.106.232.148]) by mail12.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id o1N9Jqp6017066 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 23 Feb 2010 20:19:53 +1100 X-Bogosity: Ham, spamicity=0.000000 Received: from server.vk2pj.dyndns.org (localhost.vk2pj.dyndns.org [127.0.0.1]) by server.vk2pj.dyndns.org (8.14.3/8.14.3) with ESMTP id o1N9Jmi7061163; Tue, 23 Feb 2010 20:19:48 +1100 (EST) (envelope-from peter@server.vk2pj.dyndns.org) Received: (from peter@localhost) by server.vk2pj.dyndns.org (8.14.3/8.14.3/Submit) id o1N9Jlml061162; Tue, 23 Feb 2010 20:19:47 +1100 (EST) (envelope-from peter) Date: Tue, 23 Feb 2010 20:19:47 +1100 From: Peter Jeremy To: Jeremy Chadwick Message-ID: <20100223091947.GA44123@server.vk2pj.dyndns.org> References: <20100217200322.da66c9f8.torfinn.ingolfsen@broadpark.no> <20100218205458.GA78560@server.vk2pj.dyndns.org> <20100218231223.ec6b9fa8.torfinn.ingolfsen@broadpark.no> <20100219003844.acdaa866.torfinn.ingolfsen@broadpark.no> <20100220015351.GB81639@server.vk2pj.dyndns.org> <20100220223201.178e67dd.torfinn.ingolfsen@broadpark.no> <20100221050823.GB22670@server.vk2pj.dyndns.org> <4b82483e.5OXNba8+J2F18v3D%perryh@pluto.rain.com> <20100222111810.GD12891@server.vk2pj.dyndns.org> <20100222114105.GA96234@icarus.home.lan> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="gBBFr7Ir9EOA20Yy" Content-Disposition: inline In-Reply-To: <20100222114105.GA96234@icarus.home.lan> X-PGP-Key: http://members.optusnet.com.au/peterjeremy/pubkey.asc User-Agent: Mutt/1.5.20 (2009-06-14) Cc: freebsd-stable@freebsd.org Subject: Re: ntpd struggling to keep up - how to fix? 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: Tue, 23 Feb 2010 09:19:55 -0000 --gBBFr7Ir9EOA20Yy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2010-Feb-22 03:41:05 -0800, Jeremy Chadwick w= rote: >ntpd under normal operation (not +/- 500ppm) "figure out" on its own the >average amount of drift, which is what ntpd.drift is for, correct? Yes. It takes a long time for ntpd to characterise the local system clock. Once it does so, it stores the calculated drift in ntp.drift and updates it every hour or so. This means that when ntpd is restarted, it can immediately set its PLL to a reasonably close value, rather than starting from scratch. --=20 Peter Jeremy --gBBFr7Ir9EOA20Yy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAkuDnbMACgkQ/opHv/APuIfE5wCePr4FejMFiw4RDV4Wii3xWqtI sFsAnRInukSAgdJXdHtKnaKn13dmsltk =nPGv -----END PGP SIGNATURE----- --gBBFr7Ir9EOA20Yy--