From owner-freebsd-current@FreeBSD.ORG  Tue Jul 13 14:59:21 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id C9A9A16A4CE
	for <freebsd-current@freebsd.org>;
	Tue, 13 Jul 2004 14:59:21 +0000 (GMT)
Received: from alpha.siliconlandmark.com (alpha.siliconlandmark.com
	[209.69.98.4])	by mx1.FreeBSD.org (Postfix) with ESMTP id 5FC0D43D39
	for <freebsd-current@freebsd.org>;
	Tue, 13 Jul 2004 14:59:21 +0000 (GMT)
	(envelope-from andy@siliconlandmark.com)
Received: from alpha.siliconlandmark.com (andy@localhost [127.0.0.1])
	i6DEx1jJ032355;	Tue, 13 Jul 2004 10:59:02 -0400 (EDT)
	(envelope-from andy@siliconlandmark.com)
Received: from localhost (andy@localhost)i6DEx0If032346;
	Tue, 13 Jul 2004 10:59:01 -0400 (EDT)
	(envelope-from andy@siliconlandmark.com)
X-Authentication-Warning: alpha.siliconlandmark.com: andy owned process doing
	-bs
Date: Tue, 13 Jul 2004 10:59:00 -0400 (EDT)
From: Andre Guibert de Bruet <andy@siliconlandmark.com>
To: Johan Pettersson <manlix@demonized.net>
In-Reply-To: <20040713103802.654daae4.manlix@demonized.net>
Message-ID: <20040713104934.U24726@alpha.siliconlandmark.com>
References: <200407121248.42792.ilker.ozupak@emu.edu.tr>
	<20040713103802.654daae4.manlix@demonized.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-MailScanner-Information: Please contact the ISP for more information
X-MailScanner: Found to be clean
cc: ilker.ozupak@emu.edu.tr
cc: freebsd-current@freebsd.org
Subject: Re: CPUTYPE=p4 & kernel config
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 13 Jul 2004 14:59:21 -0000


On Tue, 13 Jul 2004, Johan Pettersson wrote:

> On Mon, 12 Jul 2004 22:17:56 -0400 (EDT)
> Andre Guibert de Bruet <andy@siliconlandmark.com> wrote:
>
>> On Mon, 12 Jul 2004, Ilker OZUPAK wrote:
>>
>>> is there any kernel options that is mandatory for the
>>> "CPUTYPE=p4" case. anything to be addded to GENERIC
>>> or to not to be removed.
>>
>> Your CPU qualifies for the I686_CPU cpu directive. You may consider
>> commenting out I{4,5}86_CPU if you are not concerned with having the
>> kernel boot on older machines. You may also want to add "options
>> CPU_ENABLE_SSE".
>
> 'CPU_ENABLE_SSE' is automatically enabled when the kernel is compiled
> with 'cpu I686_CPU'.

Pentium Pros, IIs, Xeon IIs and early Celerons are 686s but they do not 
support SSE (SIMD was introduced with the PIII, IIRC). Are you positive 
that SSE floating-point calculations are enabled with I686_CPU?

Here's what the cpu features bitfield expands to on an older 686:
Features=0x183fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>

Compare this to the following, which was taken from a newer 686:
Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>

Regards,

> Andre Guibert de Bruet | Enterprise Software Consultant >
> Silicon Landmark, LLC. | http://siliconlandmark.com/    >