From owner-freebsd-questions@freebsd.org Fri Nov 17 10:18:50 2017 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id C1A26DC054C for ; Fri, 17 Nov 2017 10:18:50 +0000 (UTC) (envelope-from raimund.sacherer@logitravel.com) Received: from mail-it0-x234.google.com (mail-it0-x234.google.com [IPv6:2607:f8b0:4001:c0b::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 82E2D25E6 for ; Fri, 17 Nov 2017 10:18:50 +0000 (UTC) (envelope-from raimund.sacherer@logitravel.com) Received: by mail-it0-x234.google.com with SMTP id m191so3493842itg.2 for ; Fri, 17 Nov 2017 02:18:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=logitravel-com.20150623.gappssmtp.com; s=20150623; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to:cc; bh=RzyP6RVUT0kt2f/0law0jU/GiEElzvjgqf9xp4CjBdM=; b=khJZGYQJQyJAiZhPBK2p225pwV1V0CYkLOJNgyVOTjIAr3ZXjy2dqinRjb0xhLGcaA YLpfeIkJ03LcwNHtDOqqqVbQ7BG11DgW3nmuNesFL4s69ogK1c3Lf8s+lFHoLEHjuNik SuMyZP5yGPAAbk1WmLSXZWJ5HcJShpD9q4u5TEKTzax5/HU+TZe47pjfmKtNEZC0Q2VT asbA67SFHohuIYSp8nGCo+8nGHbiGumAlh7brG+e1ib7hS9yFk1qAG6VBkwjbEXomreX MXLuq6vKsk2TVy2Yj65aX5eRectdeKa18/9ECX+v65sUyCSsWqEyMYOPt1JDhMj0+rms M9rg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to:cc; bh=RzyP6RVUT0kt2f/0law0jU/GiEElzvjgqf9xp4CjBdM=; b=KQ4dTNgyDD63E4BErvRcnf1A97DcWBjVe+NAbmq9utg9dUTKYYOrLYQLVqYvni23Yw bCMpERaxJ1e/S96LemEPq9XABKDrXD/2Jyy5141OjGGSN+3ImRRuQhXPFMH7xoetg8qx 2xQaHMzQyK9BtJ5z5uZYF1g+8yvxxwYAU08cUY3bX5CC+v5EOe+oVUlqZ4fyiZJvYf/P m81H+RUTG6RhHECYJA19jqMBkM5AHY2+/aemTy6DXQmHVCUpstTFZNden6F3uLFoO4iK t5LPpHJoNF965JMcN0mj3AALFD5CUuaPuGX5yOOA34+SlK4qbsbtX3XKHiTYZ5AWVS4B awUg== X-Gm-Message-State: AJaThX4hUwe9rVdimWL/YLi+seTZc6dbn+aaiYfGWb6wcliFNdHkq9Dz W+RyokjdEk1C9qbOOl3wPyzJ46zXyJDy1x2fuuNvziBx X-Google-Smtp-Source: AGs4zMZczUe1aL+tDvMORZOnt8VWzp582NV8MYhd3Fo8UHc66PuWhk5i7W0T9pnYhkU08kkLskN1IWCdPg48q7QLzcg= X-Received: by 10.36.2.212 with SMTP id 203mr6058301itu.43.1510913929817; Fri, 17 Nov 2017 02:18:49 -0800 (PST) MIME-Version: 1.0 Received: by 10.79.27.10 with HTTP; Fri, 17 Nov 2017 02:18:49 -0800 (PST) Reply-To: rs@logitravel.com In-Reply-To: <20171012204455.GA10740@bsd118.wpafb.af.mil> References: <3967.1507825257@segfault.tristatelogic.com> <20171012204455.GA10740@bsd118.wpafb.af.mil> From: Raimund Sacherer Date: Fri, 17 Nov 2017 11:18:49 +0100 Message-ID: Subject: Re: Another 11.1-RELEASE install minor annoyance (ntpd) To: vogelke@pobox.com Cc: freebsd-questions@freebsd.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Nov 2017 10:18:50 -0000 > Second, ntpd, internally, is built on a phase-locked loop, which is > supposed to stabilize its time corrections in the face of jitter and > other > bad things out in the real world. Like anything based on a negative > feedback loop, however, it can be destablized with certain inputs. > Giving ntpd two or more servers is a pretty good way to destabilize its > PLL in the real, non-ideal world we find on the modern Internet. > To anyone considering flaming me, please read this first: > > http://queue.acm.org/detail.cfm?id=3D1773943 > > At minimum, read the section "One server is enough". The bit on PLLs > about halfway down is also directly relevant. > > Hello, I read the article, but I am astonished, I am by no means any expert in time, but the article is from a lot of years back and I was questioning what was written there. Is ntp really working like they say, jumping from one time server to another? I thought it to be some sort of consensus based protocoll where it queries a couple of servers, boots off servers which are way off, and creates a consensus on the remaining ones? I would love if someone knowledgable how the protocol works could say if it really is better to have one server instead of a couple more? If so, than why most default configuration (like ubuntu) have 4 or 5 servers configured? The article also read a bit as promotional vehicle for radclock, but checking out radclocks webpage, their last modification seems to be 2015, and they still claim the "we like to have ready in 2 years" statement they had in 2008 .... Best Ray > -- > Karl Vogel I don't speak for the USAF or my company > > Teenage girl creates sustainable, renewable algae biofuel under her bed > --Extreme Tech headline, 19 March 201= 3 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions- > unsubscribe@freebsd.org" > --=20 Raimund Sacherer Head of Tele-Communications Logitravel Group Edificio Logitravel Parcela 3B, Parc Bit Ctra. Palma - Valldemossa km 7,4 07121 Palma de Mallorca Tel 971 080 125 - 0145 Fax 971 213 495 L.O. 15/1999: Sus datos personales est=C3=A1n incorporados a un fichero de = la entidad remitente para el mantenimiento de las comunicaciones rec=C3=ADproc= as por cuestiones derivadas de su actividad. 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