From owner-freebsd-arch@FreeBSD.ORG Fri Mar 19 16:12:18 2010 Return-Path: Delivered-To: freebsd-arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 69E891065672; Fri, 19 Mar 2010 16:12:18 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from tarsier.geekcn.org (tarsier.geekcn.org [IPv6:2001:470:a803::1]) by mx1.freebsd.org (Postfix) with ESMTP id 10AAB8FC17; Fri, 19 Mar 2010 16:12:18 +0000 (UTC) Received: from mail.geekcn.org (tarsier.geekcn.org [211.166.10.233]) by tarsier.geekcn.org (Postfix) with ESMTP id 1E2E7A57C1A; Sat, 20 Mar 2010 00:12:17 +0800 (CST) X-Virus-Scanned: amavisd-new at geekcn.org Received: from tarsier.geekcn.org ([211.166.10.233]) by mail.geekcn.org (mail.geekcn.org [211.166.10.233]) (amavisd-new, port 10024) with LMTP id nBmr5xZC2GDJ; Sat, 20 Mar 2010 00:12:10 +0800 (CST) Received: from delta.delphij.net (drawbridge.ixsystems.com [206.40.55.65]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by tarsier.geekcn.org (Postfix) with ESMTPSA id 6CADFA67C50; Sat, 20 Mar 2010 00:12:09 +0800 (CST) DomainKey-Signature: a=rsa-sha1; s=default; d=delphij.net; c=nofws; q=dns; h=message-id:date:from:reply-to:organization:user-agent: mime-version:to:cc:subject:references:in-reply-to: x-enigmail-version:openpgp:content-type:content-transfer-encoding; b=n2Bdmvc7V0D4zmui/hINqG9t795F1bN5XIF3/y8/vDLznwaeqN5Cl+pOvBYygRRtM IQYUI07wo/2D4LtcW6QoQ== Message-ID: <4BA3A250.2080204@delphij.net> Date: Fri, 19 Mar 2010 09:12:00 -0700 From: Xin LI Organization: The Geek China Organization User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.1.8) Gecko/20100304 Thunderbird/3.0.3 ThunderBrowse/3.2.8.1 MIME-Version: 1.0 To: John Baldwin References: <4BA2CE17.2050105@delphij.net> <201003190751.26767.jhb@freebsd.org> In-Reply-To: <201003190751.26767.jhb@freebsd.org> X-Enigmail-Version: 1.0.1 OpenPGP: id=3FCA37C1; url=http://www.delphij.net/delphij.asc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: d@delphij.net, freebsd-arch@freebsd.org Subject: Re: [PATCH] Utilize i686, SSE and MMX by default on FreeBSD/i386 X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: d@delphij.net List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 19 Mar 2010 16:12:18 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2010/03/19 04:51, John Baldwin wrote: > On Thursday 18 March 2010 9:06:31 pm Xin LI wrote: >> Hi, >> >> I think it doesn't really make sense to by default use MACHINE_CPU=i486 >> when the kernel is built with SSE by default today. >> >> Attached patch uses i686 SSE MMX by default, the user can always change >> the default setting by overriding CPUTYPE (they have to do it as SSE is >> enabled by default for several years). > > The kernel is only built with support for userland applications using SSE, it > does not _use_ SSE. Similarly, the kernel is built with support for PG_NX > provided on 64-bit processors, but it does not do so by failing to support > older 32-bit processors. I think this change is premature. Users can already > set CPUTYPE in make.conf. Also, most modern x86 server-class machines are > 64-bit in which case they would be running FreeBSD/amd64 and using SSE > already. Yes you are right. Sorry for the confusion. Cheers, - -- Xin LI http://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iQEcBAEBAgAGBQJLo6JPAAoJEATO+BI/yjfBVZ4IAIcyFNbDKwtpKQyU9xg5T9B1 JeJXA7pyMnb5YydJy5KR/Kw5RTpRoMzp64CuMDfBLH1oEbxHaFGGlwqm+qwNnk2S a1CraA/9vmr4oOZbIso6jAhEBet1l8+O6hcMfhs9+8LnZpgkUbhikYOABQwVRaw7 xhMQYaEXseB5rltavgqlSQcDlmS3mctuyBuS1KGa0ONGxt4dT5giEWcmpvruouF9 MyGsElWA7iUW2c1EjPywGlPW3M2pSdzaIySDK4eE4w1jmtjl+gzQ0TMNdcNVpGo7 jKb4eZD1oxLAg5ljxbRQCTeK199TNPBYktAnaiIZa/FEDa7cHGURf7EsipDkTv4= =0n/e -----END PGP SIGNATURE-----