From owner-freebsd-questions@FreeBSD.ORG  Wed Jan 14 20:44:09 2009
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 21D0F1065670
	for <freebsd-questions@freebsd.org>;
	Wed, 14 Jan 2009 20:44:09 +0000 (UTC)
	(envelope-from marshc187@gmail.com)
Received: from mail-qy0-f17.google.com (mail-qy0-f17.google.com
	[209.85.221.17])
	by mx1.freebsd.org (Postfix) with ESMTP id CAF988FC17
	for <freebsd-questions@freebsd.org>;
	Wed, 14 Jan 2009 20:44:08 +0000 (UTC)
	(envelope-from marshc187@gmail.com)
Received: by qyk10 with SMTP id 10so1052440qyk.19
	for <freebsd-questions@freebsd.org>;
	Wed, 14 Jan 2009 12:44:08 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:received:received:message-id:date:from:to
	:subject:in-reply-to:mime-version:content-type:references;
	bh=mouwmDrK79ygikK3R8UK0/k0SgRYJda4ESjQCoMlXdw=;
	b=GYYlbQmzL9pjtBkUkEbYyU3OyNYGpv8uO4ZevnV4WjovlrqzVhvcTq8ZwCR7rPbeej
	jLA2nPqhOFMI4VvokdQufvUSywGt9TtPU+p1iyk8aSgKwNklDonCkhdr4qovZa8hUBk9
	N9twE7sxlsUnsiREFYsohtQmxVnK7Y9Ul1TPQ=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=message-id:date:from:to:subject:in-reply-to:mime-version
	:content-type:references;
	b=co8gzmCSAiqcyu7IFy5TJmCdsvy6AOFgwBTbvGCNyhH0Yx4jvFCw+d/cHqQPBCbh8w
	65Q+siojRrISxSMmg9bA/ajXwPyTPf1gzDMOlbfezCwuSGf8235x++nvETvxYYfljyM3
	ioskjyZeKRijJ8JEJfgIvMJTbX/Ig6sArGrOk=
Received: by 10.214.45.4 with SMTP id s4mr880222qas.173.1231965848010;
	Wed, 14 Jan 2009 12:44:08 -0800 (PST)
Received: by 10.215.14.1 with HTTP; Wed, 14 Jan 2009 12:44:07 -0800 (PST)
Message-ID: <332f78510901141244y198e7be6qf3b34f306c03f232@mail.gmail.com>
Date: Wed, 14 Jan 2009 21:44:07 +0100
From: t-u-t <marshc187@gmail.com>
To: freebsd-questions@freebsd.org
In-Reply-To: <B4DD918A-6026-4206-9C14-70DCD0028CFB@mac.com>
MIME-Version: 1.0
References: <496E06D1.2070706@gmail.com>
	<20090114181522.GB4487@aurora.oekb.co.at>
	<B4DD918A-6026-4206-9C14-70DCD0028CFB@mac.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
X-Content-Filtered-By: Mailman/MimeDel 2.1.5
Subject: Re: kernel configuration
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 14 Jan 2009 20:44:09 -0000

On Wed, Jan 14, 2009 at 9:18 PM, Chuck Swiger <cswiger@mac.com> wrote:

> On Jan 14, 2009, at 10:15 AM, Ewald Jenisch wrote:
>
>> On Wed, Jan 14, 2009 at 04:37:53PM +0100, icemaca wrote:
>>
>>>
>>> this i386 version has
>>>
>>> cpu             I486_CPU
>>> cpu             I586_CPU
>>> cpu             I686_CPU
>>>
>>>
>> Basically you can comment all but I686_CPU since the others are for
>> earlier x86 architectures.
>>
>
> While it is true that you can comment out all but i686 and get a working
> kernel, you will experience reduced performance.  There are a number of
> low-level assembly routines (cf sys/i386/i386/support.s such as i586_bcopy)
> that are conditionalized off of I586_CPU only, even though they provide an
> advantage on i686 platforms also.
>
> --
> -Chuck
>

so in any case it doesn't hurt to leave all 3. right?

I have one last question though, is

makeoptions DEBUG=g necessary if i am not debugging or is it always
necessary to build the kernel properly? can i safely comment it out?