From owner-freebsd-hackers@FreeBSD.ORG Mon Mar 30 12:28:26 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C885C1065675 for ; Mon, 30 Mar 2009 12:28:26 +0000 (UTC) (envelope-from joerg@britannica.bec.de) Received: from www.sonnenberger.org (www.ostsee-abc.de [62.206.222.50]) by mx1.freebsd.org (Postfix) with ESMTP id 848258FC08 for ; Mon, 30 Mar 2009 12:28:26 +0000 (UTC) (envelope-from joerg@britannica.bec.de) Received: from britannica.bec.de (www.sonnenberger.org [192.168.1.10]) by www.sonnenberger.org (Postfix) with ESMTP id 1673E66794 for ; Mon, 30 Mar 2009 14:28:22 +0200 (CEST) Received: by britannica.bec.de (Postfix, from userid 1000) id 82EB91BD87F; Mon, 30 Mar 2009 14:28:22 +0200 (CEST) Date: Mon, 30 Mar 2009 14:28:22 +0200 From: Joerg Sonnenberger To: freebsd-hackers@freebsd.org Message-ID: <20090330122821.GA1391@britannica.bec.de> Mail-Followup-To: freebsd-hackers@freebsd.org References: <20090329180745.GB38985@server.vk2pj.dyndns.org> <9969.1238398362@critter.freebsd.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9969.1238398362@critter.freebsd.dk> User-Agent: Mutt/1.5.19 (2009-01-05) Subject: Re: Improving the kernel/i386 timecounter performance (GSoC proposal) X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Mar 2009 12:28:27 -0000 On Mon, Mar 30, 2009 at 07:32:42AM +0000, Poul-Henning Kamp wrote: > On systems where the ACPI or HPET hardware can be memory-mapped, I should > be equally possible to map those read-only into userland processes. Both are IO memory and contain other data. There is also the question of how "undefined" is implemented for locked bus cycles to them... Joerg