From owner-cvs-src@FreeBSD.ORG Fri Oct 21 16:03:58 2005 Return-Path: X-Original-To: cvs-src@FreeBSD.org Delivered-To: cvs-src@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 431F016A41F; Fri, 21 Oct 2005 16:03:58 +0000 (GMT) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (vc4-2-0-87.dsl.netrack.net [199.45.160.85]) by mx1.FreeBSD.org (Postfix) with ESMTP id C987143D45; Fri, 21 Oct 2005 16:03:57 +0000 (GMT) (envelope-from imp@bsdimp.com) Received: from localhost (localhost.village.org [127.0.0.1] (may be forged)) by harmony.bsdimp.com (8.13.3/8.13.3) with ESMTP id j9LG0tFs026115; Fri, 21 Oct 2005 10:00:56 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Fri, 21 Oct 2005 10:02:19 -0600 (MDT) Message-Id: <20051021.100219.111271614.imp@bsdimp.com> To: phk@phk.freebsd.dk From: "M. Warner Losh" In-Reply-To: <30677.1129909322@critter.freebsd.dk> References: <20051021.093234.116607170.imp@bsdimp.com> <30677.1129909322@critter.freebsd.dk> X-Mailer: Mew version 3.3 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.0 (harmony.bsdimp.com [127.0.0.1]); Fri, 21 Oct 2005 10:00:56 -0600 (MDT) Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, andre@FreeBSD.org, cvs-all@FreeBSD.org, bde@zeta.org.au Subject: Re: cvs commit: src/usr.bin/vmstat vmstat.c src/usr.bin/w w.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Oct 2005 16:03:58 -0000 In message: <30677.1129909322@critter.freebsd.dk> "Poul-Henning Kamp" writes: : In message <20051021.093234.116607170.imp@bsdimp.com>, "M. Warner Losh" writes: : : >It is a problem. If I boot a system today, the authors of the : >software still cannot know the example that I gave. Since there's no : >leap second table by default, the system may get the answer wrong. : >That's what is so evil about leap seconds. You can't plan more than 6 : >months into the future. : : It's worse than 6 months, just because IERS says there will or wont : be a leap second in 6 months time doesn't mean that they can't change : their mind later on, technically it is only one month ahead. : : Fortunately, this is not relevant with the current geophysics. True. The international standard on leap seconds does say they can happen at the end of any month, with June/Dec being primary and Mar/Sept being secondary. If current models are accurate, we'll need more than two leap seconds a year in the next century or so. We'll need more than 12 a century or so after that. And more than one a day in a few thousand years. Clearly a better way to sychronize time will be needed at some point. I vote steering the earth so that its rotation is restored to its true length :-) Still haven't mentioned that deep and abiding love for leap seconds... Warner