From owner-svn-src-head@FreeBSD.ORG Thu Mar 17 09:10:47 2011 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 04DA6106564A; Thu, 17 Mar 2011 09:10:47 +0000 (UTC) (envelope-from bzeeb-lists@lists.zabbadoz.net) Received: from mx1.sbone.de (bird.sbone.de [46.4.1.90]) by mx1.freebsd.org (Postfix) with ESMTP id 8D84D8FC18; Thu, 17 Mar 2011 09:10:46 +0000 (UTC) Received: from mail.sbone.de (mail.sbone.de [IPv6:fde9:577b:c1a9:31::2013:587]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by mx1.sbone.de (Postfix) with ESMTPS id C9FAA25D3888; Thu, 17 Mar 2011 08:53:47 +0000 (UTC) Received: from content-filter.sbone.de (content-filter.sbone.de [IPv6:fde9:577b:c1a9:31::2013:2742]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPS id A7380159AF28; Thu, 17 Mar 2011 08:53:46 +0000 (UTC) X-Virus-Scanned: amavisd-new at sbone.de Received: from mail.sbone.de ([IPv6:fde9:577b:c1a9:31::2013:587]) by content-filter.sbone.de (content-filter.sbone.de [fde9:577b:c1a9:31::2013:2742]) (amavisd-new, port 10024) with ESMTP id 7AKPDErKsSki; Thu, 17 Mar 2011 08:53:45 +0000 (UTC) Received: from nv.sbone.de (nv.sbone.de [IPv6:fde9:577b:c1a9:31::2013:138]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.sbone.de (Postfix) with ESMTPSA id 167E7159AFAB; Thu, 17 Mar 2011 08:53:44 +0000 (UTC) Date: Thu, 17 Mar 2011 08:53:43 +0000 (UTC) From: "Bjoern A. Zeeb" To: src-committers@freebsd.org In-Reply-To: <4D8190C1.4090004@freebsd.org> Message-ID: References: <201103152145.p2FLjAlt060256@svn.freebsd.org> <20110316004503.GM99496@mdounin.ru> <201103161233.16347.jkim@FreeBSD.org> <20110316174553.GA6367@freebsd.org> <20110316200346.GA36431@owl.midgard.homeip.net> <4D8190C1.4090004@freebsd.org> X-OpenPGP-Key: 0x14003F198FEFA3E77207EE8D2B58B8F83CCF1842 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r219679 - head/sys/i386/include X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Mar 2011 09:10:47 -0000 On Wed, 16 Mar 2011, Julian Elischer wrote: > On 3/16/11 2:16 PM, Ivan Voras wrote: >> On 16 March 2011 21:03, Erik Trulsson wrote: >>> On Wed, Mar 16, 2011 at 06:45:53PM +0100, Roman Divacky wrote: >>>> On Wed, Mar 16, 2011 at 12:32:56PM -0400, Jung-uk Kim wrote: >>>>> On Tuesday 15 March 2011 08:45 pm, Maxim Dounin wrote: >>>>>> This isn't really different as long as GENERIC kernel used, as >>>>>> GENERIC defines I486_CPU. >>>>> Fixed in r219698, sorry. >>>>> >>>>> Actually, I think we should remove i486 from GENERIC at some point. >>>>> It has too many limitations. For example, I really love to implement >>>>> atomic 64-bit mem read/write using cmpxchg8b (no 0xf00f joke, please) >>>>> but I cannot do that cleanly without removing I486 support or >>>>> checking cpu_class at run-time. :-( >>>> if we drop i486 I think it makes sense to require something that has >>>> at least SSE2, thus we can have the same expectations as on amd64. >>> No, that would remove support from far too many machines that people >>> actually use to run FreeBSD. >>> There are probably only a handful of people (if that) who actually run >>> FreeBSD on an actual 486-class machine, but requiring SSE2 would mean >>> dropping support for Pentium-III and Athlon-XP equipped machines and >>> I believe there are a large number of such machines still in use, and >>> they are still perfectly suitable for a large number of tasks. >> This is understandable but I also think it deserves a poll at stable@ >> and current@. It might be worth keeping i486 for all of 9-stable but >> removing it before 10-stable. Judging from previous releases, 9.x >> would be supported until at least 2016. I don't follow the embedded >> world that much, but from what I saw, most (incl. Soekris) are moving >> to Atom designs which support SSE2. > > not sure what is in the Soekris and other embedded machines but do keep them > in mind. > > many are now 586 class I guess but there may still be some 486 ones around. > I believe you can now get a 486 core in some arrays. You mean something like this .. though it's not a fully classic? It's one of the soekris boxes I boot/run as long as I manage to get a kernel and a world in an mdimage booted from tftp... yes you can still get down to that tiny size though there's a lot of ignorance for that in our tree these days. CPU: AMD Enhanced Am486DX4/Am5x86 Write-Back (486-class CPU) Origin = "AuthenticAMD" Id = 0x494 Stepping = 4 Features=0x1 real memory = 33554432 (32 MB) /bz -- Bjoern A. Zeeb You have to have visions! Stop bit received. Insert coin for new address family.