From owner-freebsd-stable@FreeBSD.ORG Sun Aug 1 01:25:24 2004 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 75FD516A4CF for ; Sun, 1 Aug 2004 01:25:24 +0000 (GMT) Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [128.30.28.20]) by mx1.FreeBSD.org (Postfix) with ESMTP id 06F3543D62 for ; Sun, 1 Aug 2004 01:25:24 +0000 (GMT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: from khavrinen.lcs.mit.edu (localhost [IPv6:::1]) by khavrinen.lcs.mit.edu (8.12.9/8.12.9) with ESMTP id i711P58g056312 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK CN=khavrinen.lcs.mit.edu issuer=SSL+20Client+20CA); Sat, 31 Jul 2004 21:25:06 -0400 (EDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.12.9/8.12.9/Submit) id i711P44H056311; Sat, 31 Jul 2004 21:25:04 -0400 (EDT) (envelope-from wollman) Date: Sat, 31 Jul 2004 21:25:04 -0400 (EDT) From: Garrett Wollman Message-Id: <200408010125.i711P44H056311@khavrinen.lcs.mit.edu> To: oberman@es.net In-Reply-To: <20040731231908.18F485D08@ptavv.es.net> References: <20040731.144627.06076085.imp@bsdimp.com> Organization: MIT Laboratory for Computer Science X-Spam-Score: -9.9 () IN_REP_TO,REFERENCES X-Scanned-By: MIMEDefang 2.37 cc: FreeBSD-stable@FreeBSD.org Subject: Re: Looking for ntp/PPS setup guide X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Aug 2004 01:25:24 -0000 In article <20040731231908.18F485D08@ptavv.es.net> you write: >From what I have seen, the non-kernel PPS software handles jitter more >gracefully than the kernel version. Which CDMA receiver do you have? I'm using one from EndRun Technologies which emulates a Trimble Palisade and it seems to perform fairly well: remote refid st t when poll reach delay offset jitter ============================================================================== *GPS_PALISADE(0) .CDMA. 0 l 1 32 377 0.000 -0.016 0.008 +NAVOBS1.MIT.EDU .PSC. 1 u 37 64 377 0.836 0.027 0.025 xtime-b.nist.gov .ACTS. 1 u 49 64 377 15.477 -6.898 9.374 +ntp2.usno.navy. .USNO. 1 u 10 64 337 40.016 -2.378 83.946 -gps.freebsd.dk .GPS. 1 u 51 64 377 115.848 4.315 1.408 This receiver was recommended to me by Dave Andersen (dga@). (Actually, I stole it from him.) This is using the host-triggered timestamp mode of this device rather than PPS. -GAWollman