From owner-freebsd-chat@FreeBSD.ORG Mon Mar 26 13:08:32 2007 Return-Path: X-Original-To: freebsd-chat@freebsd.org Delivered-To: freebsd-chat@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id D8B8116A406 for ; Mon, 26 Mar 2007 13:08:32 +0000 (UTC) (envelope-from jan.grant@bristol.ac.uk) Received: from diri.bris.ac.uk (diri.bris.ac.uk [137.222.10.112]) by mx1.freebsd.org (Postfix) with ESMTP id 9E4A913C48C for ; Mon, 26 Mar 2007 13:08:32 +0000 (UTC) (envelope-from jan.grant@bristol.ac.uk) Received: from mail.ilrt.bris.ac.uk ([137.222.16.62]) by diri.bris.ac.uk with esmtp (Exim 4.66) (envelope-from ) id 1HVoh0-0001CN-KS; Mon, 26 Mar 2007 13:53:05 +0100 Received: from cse-jg.cse.bris.ac.uk ([137.222.12.37]:60649) by mail.ilrt.bris.ac.uk with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.50) id 1HVogn-0001Gy-LL; Mon, 26 Mar 2007 13:52:45 +0100 Date: Mon, 26 Mar 2007 13:52:45 +0100 (BST) From: Jan Grant X-X-Sender: cmjg@tribble.ilrt.bris.ac.uk To: deeptech71@gmail.com In-Reply-To: <4606D88E.4080503@gmail.com> Message-ID: <20070326134452.L69197@tribble.ilrt.bris.ac.uk> References: <200703251900.l2PJ0Z8w058298@lurza.secnetix.de> <4606D88E.4080503@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-ILRT-MailScanner: Found to be clean X-ILRT-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=0.039, required 5, autolearn=disabled, ALL_TRUSTED -1.44, AWL 1.20, MAILTO_TO_SPAM_ADDR 0.28) X-ILRT-MailScanner-From: jan.grant@bristol.ac.uk X-Spam-Status: No X-Spam-Score: -1.2 X-Spam-Level: - Cc: freebsd-chat@freebsd.org Subject: Re: 64bit timestamp X-BeenThere: freebsd-chat@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Non technical items related to the community List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Mar 2007 13:08:32 -0000 On Sun, 25 Mar 2007, deeptech71@gmail.com wrote: > Oliver Fromme wrote: > > Giorgos Keramidas wrote: > > On 2007-03-25 01:36, deeptech71@gmail.com wrote: > >> Oliver Fromme wrote: > >>> FreeBSD's UFS2 already uses 96bit timestamps, where 64 bits are used > >>> for seconds and 32 bits are used for nanoseconds. Is that sufficient > >>> for you? > >> What the hell for? > > > > ``Just because it can.'' > > Good. :] 2x64bit for x64? To measure what? Even at nanosecond resolution, the notion of timestamping an event seems a little arbitrary. Much beyond it and it's not clear exactly what you're "measuring" - or even if there is any physical interpretation. -- jan grant, ISYS, University of Bristol. http://www.bris.ac.uk/ Tel +44 (0)117 3317661 http://ioctl.org/jan/ The only certain way to prevent another 9/11 is via universal calendar reform.