Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756699AbZAGNdd (ORCPT ); Wed, 7 Jan 2009 08:33:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757513AbZAGNdQ (ORCPT ); Wed, 7 Jan 2009 08:33:16 -0500 Received: from bee.hiwaay.net ([216.180.54.11]:33108 "EHLO bee.hiwaay.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757392AbZAGNdP (ORCPT ); Wed, 7 Jan 2009 08:33:15 -0500 Date: Wed, 7 Jan 2009 07:33:06 -0600 From: Chris Adams To: David Newall Cc: linux-kernel@vger.kernel.org Subject: Re: Bug: Status/Summary of slashdot leap-second crash on new years 2008-2009 Message-ID: <20090107133306.GA1506277@hiwaay.net> References: <49614835.7000505@davidnewall.com> <3ae3aa420901042148o1c96985dube8e03085c997a07@mail.gmail.com> <20090105143335.GC18055@mail.local.tull.net> <4962BB13.7060304@davidnewall.com> <20090106025125.GB28431@mail.local.tull.net> <20090106094058.64c89586@lxorguk.ukuu.org.uk> <496479EA.1020207@davidnewall.com> <20090107095419.70b78dc7@lxorguk.ukuu.org.uk> <49648163.9060007@davidnewall.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <49648163.9060007@davidnewall.com> User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1459 Lines: 37 Once upon a time, David Newall said: > The remaining fly in the ointment, if indeed the NTP client doesn't > already do what I've outlined, is that leap seconds aren't reckoned into > NTP broadcasts. As intimated, this is correctable using leap second > information from zoneinfo. No it isn't; you are still wrong. Yet again, you are ignoring the facts: - zoneinfo is for offset from UTC, leap seconds are changes in UTC - the standards say that time() returns seconds since the epoch in UTC _except_ explicity NOT including leap seconds - NTP already has a way to distribute leap second information to trusted clients > Even though this is manifestly not a kernel issue, I'll work up a patch > for ntpdate (apparently what I use) and post her, which I'm sure will be > useful for all other NTP clients. ntpdate is obsolete. > However it is now clear that no special kernel support is required for > leap-seconds, and any such code that's been incorporated needs to be > removed. Removed I say! And you are wrong. -- Chris Adams Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/