From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760904AbZAHPFo (ORCPT ); Thu, 8 Jan 2009 10:05:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751778AbZAHPFb (ORCPT ); Thu, 8 Jan 2009 10:05:31 -0500 Received: from bsdimp.com ([199.45.160.85]:54460 "EHLO harmony.bsdimp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758897AbZAHPF3 (ORCPT ); Thu, 8 Jan 2009 10:05:29 -0500 Date: Thu, 08 Jan 2009 08:02:29 -0700 (MST) Message-Id: <20090108.080229.1159156694.imp@bsdimp.com> To: alan@lxorguk.ukuu.org.uk Cc: mayer@ntp.isc.org, linasvepstas@gmail.com, david@lang.hm, hancockr@shaw.ca, kyle@moffetthome.net, slashdot@jameshallam.info, goodgerster@gmail.com, davidn@davidnewall.com, linux-kernel@vger.kernel.org, ntpwg@lists.ntp.isc.org, pretzalz@techhouse.org, burdell@iruntheinter.net, nick@nick-andrew.net, jeff@kosowsky.org Subject: Re: [ntpwg] Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009 From: "M. Warner Losh" In-Reply-To: <20090108104854.2dbc41b1@lxorguk.ukuu.org.uk> References: <496579C2.5050800@ntp.isc.org> <20090107.214220.-233694826.imp@bsdimp.com> <20090108104854.2dbc41b1@lxorguk.ukuu.org.uk> X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In message: <20090108104854.2dbc41b1@lxorguk.ukuu.org.uk> Alan Cox writes: : > On FreeBSD, Solaris and Digital Unix, I'll point out, that jumping : > backwards is used, and has been used since at least 1994. So saying : > it isn't used in the world today is flat out wrong. : : I stand by my comment - when was the last time the IERS used a leap : second removal ? The code may exist but it doesn't happen. Jumping backwards is used for every leap second that IERS has ever done, which was your original comment. There's has never been a case where there was a leap second for jump forward though. The proper technical term here is 'negative leap second'. All leap seconds up until now have been positive leap seconds, and it is unlikely there ever will be a negative one. Warner