From owner-freebsd-arch@FreeBSD.ORG Wed Sep 19 02:13:49 2007 Return-Path: Delivered-To: arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3AAE116A420 for ; Wed, 19 Sep 2007 02:13:49 +0000 (UTC) (envelope-from wollman@hergotha.csail.mit.edu) Received: from hergotha.csail.mit.edu (hergotha.csail.mit.edu [66.92.79.170]) by mx1.freebsd.org (Postfix) with ESMTP id C9E3813C4B6 for ; Wed, 19 Sep 2007 02:13:48 +0000 (UTC) (envelope-from wollman@hergotha.csail.mit.edu) Received: from hergotha.csail.mit.edu (localhost [127.0.0.1]) by hergotha.csail.mit.edu (8.13.8/8.13.8) with ESMTP id l8J1hJmc074277; Tue, 18 Sep 2007 21:43:19 -0400 (EDT) (envelope-from wollman@hergotha.csail.mit.edu) Received: (from wollman@localhost) by hergotha.csail.mit.edu (8.13.8/8.13.8/Submit) id l8J1hJKA074148; Tue, 18 Sep 2007 21:43:19 -0400 (EDT) (envelope-from wollman) Date: Tue, 18 Sep 2007 21:43:19 -0400 (EDT) From: Garrett Wollman Message-Id: <200709190143.l8J1hJKA074148@hergotha.csail.mit.edu> To: jroberson@chesapeake.net In-Reply-To: <20070918153536.D558@10.0.0.1> References: <20070917165657.B558@10.0.0.1> <46EF644E.9050207@elischer.org> <20070918012555.G558@10.0.0.1> <46EFE4BD.4030505@freebsd.org> <20070918142115.C558@10.0.0.1> Organization: None X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (hergotha.csail.mit.edu [127.0.0.1]); Tue, 18 Sep 2007 21:43:19 -0400 (EDT) X-Spam-Status: No, score=-0.0 required=5.0 tests=SPF_HELO_PASS,SPF_PASS autolearn=disabled version=3.1.8 X-Spam-Checker-Version: SpamAssassin 3.1.8 (2007-02-13) on hergotha.csail.mit.edu Cc: , arch@freebsd.org Subject: Re: 64bit ticks, was Re: Changing p_swtime and td_slptime to ticks X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Sep 2007 02:13:49 -0000 Jeff Roberson writes: >Is there a good reason for not making ticks 64bit? math involving this >value is relatively infrequent. Bruce? Any comments? It'd sure let us >forget all of these counter wrapping problems. Making ticks 64 bits on 32-bit architectures means that updates to it will not be atomic. -GAWollman -- Garrett A. Wollman | The real tragedy of human existence is not that we are wollman@csail.mit.edu| nasty by nature, but that a cruel structural asymmetry Opinions not those | grants to rare events of meanness such power to shape of MIT or CSAIL. | our history. - S.J. Gould, Ten Thousand Acts of Kindness