From owner-svn-src-head@freebsd.org Sat Mar 4 15:49:59 2017 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 88766CF2E6C for ; Sat, 4 Mar 2017 15:49:59 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from nm30-vm5.bullet.mail.ne1.yahoo.com (nm30-vm5.bullet.mail.ne1.yahoo.com [98.138.91.252]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 545711BF0 for ; Sat, 4 Mar 2017 15:49:59 +0000 (UTC) (envelope-from pfg@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1488642592; bh=QuuFBCwZ8MCmxmgsgZZfFvTOzkZGjs6JHvqWkhOuAok=; h=From:Subject:To:References:Cc:Date:In-Reply-To:From:Subject; b=tDf8tkmiaj3A/skXps2lrpF7TllqkPR92TVht5Ny2hYjhnNc4MKmJLdZb2G+UoNZ2kFZjtAIWyUn8Yw6dOhJiBjWVeyCYpF6ByZUj6g5NrGfeuO8CdjEZZByQjnDm1fL4r1B0CgdPAGPqLOvILScz3i76SMMpBaD+cNoIKcJsuXRr1bW1ihvoGoSPiRbzrsS1aqfdEwSp9KYlwH/vSX+e3IxXY/WqSL7kftql6/qF6JlUPmdM35BZ17RxdB+sW9o7lzDai5Y328pzwjvLk2nwlHNbRtDh0zbC4lvj2YFKcr+DiGMlfbCQpznYHW+QRibrywcEF6d8sHgYtd4fncYtA== Received: from [98.138.226.177] by nm30.bullet.mail.ne1.yahoo.com with NNFMP; 04 Mar 2017 15:49:52 -0000 Received: from [98.138.226.31] by tm12.bullet.mail.ne1.yahoo.com with NNFMP; 04 Mar 2017 15:49:52 -0000 Received: from [127.0.0.1] by smtp202.mail.ne1.yahoo.com with NNFMP; 04 Mar 2017 15:49:52 -0000 X-Yahoo-Newman-Id: 689296.55429.bm@smtp202.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: m99WEU4VM1k_CQfzscU7pOvcEgR54vUNJj0BiGuXf.D64WC YbrQLA.V36K6JEmrvsTZTKl2Ad7eo0sj77FDc72UAtRFoQ6Jlk08lMP5RjDg WsYLPoOPCkJ6o254Pcvzo75aXvKmx0Rg8StmigQg5PciL24D8xHy8Nw4o1Ql 6rg0eMLFfvBM8Kv5aKW_O9zP16PPyA8PfiKwXKfdQuHhU0OgP01tmv_Ev1cR p2H9eu2zkIN2j1pzxC7r2zDJfV4R1RW87lr8UFBTRs3ASaS7FTgeoikNYWCM LHDBxmnxOMvxa7d0T_6wo6_QTHlkLQUFMAmS42reqGwLOap0CVO5j0tpKGA4 bbhJyK_Sj2yoor59Zg3SwX8FFKneOSEgev.dR_meuJIlBhqXmf.wFnKMtgFZ huH3U4GebQkg9B9SH9q3ZYPzWgZ6SG.fEZHWx8tK8A7g2pNQONm2UKfUVq82 c4XPvSEsKOZeEhyvp8VzKvGxDkYcABfwSW984NRNKzauFR5_cEY70mv0nRlU bJvmkOEgObTzJ0cNX12GmZotYkAwpJNfE2kkmkbRI0E4dsrs- X-Yahoo-SMTP: xcjD0guswBAZaPPIbxpWwLcp9Unf From: Pedro Giffuni Subject: Re: svn commit: r314669 - head/sys/i386/conf To: Slawa Olhovchenkov References: <201703041504.v24F4HMh023937@repo.freebsd.org> <20170304153228.GM15630@zxy.spb.ru> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Organization: Apache Software Foundation Message-ID: Date: Sat, 4 Mar 2017 10:52:46 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.7.1 MIME-Version: 1.0 In-Reply-To: <20170304153228.GM15630@zxy.spb.ru> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 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: Sat, 04 Mar 2017 15:49:59 -0000 On 03/04/17 10:32, Slawa Olhovchenkov wrote: > On Sat, Mar 04, 2017 at 03:04:17PM +0000, Pedro F. Giffuni wrote: > >> Author: pfg >> Date: Sat Mar 4 15:04:17 2017 >> New Revision: 314669 >> URL: https://svnweb.freebsd.org/changeset/base/314669 >> >> Log: >> Drop i486 from the default i386 GENERIC kernel configuration. >> >> 80486 production was stopped by Intel on September 2007. Dropping the 486 >> configuration option from the GENERIC kernel improves performance >> slightly. >> >> Removing I486_CPU is consistent at this time: we don't support any >> processor without a FPU and the PC-98 arch, which frequently involved i486 >> CPUs, is also gone so we don't test such platforms anymore. > > What is realy mean? This means we don't do work-arounds that would be required for raw 486. Instead we will use the 586 instructions by default. > Some Via CPU is like i486 (by instruction set). > > CPU: VIA Ezra (800.04-MHz 686-class CPU) > Origin="CentaurHauls" Id=0x678 Family=0x6 Model=0x7 Stepping=8 > Features=0x803035 > AMD Features=0x80000000<3DNow!> > 486 never had MMX extensions. This is a 686, performance should improve ~4%. Pedro.