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Date:      Wed, 14 Jan 2009 12:18:44 -0800
From:      Chuck Swiger <cswiger@mac.com>
To:        Ewald Jenisch <a@jenisch.at>
Cc:        icemaca <icemaca@gmail.com>, freebsd-questions@freebsd.org
Subject:   Re: kernel configuration
Message-ID:  <B4DD918A-6026-4206-9C14-70DCD0028CFB@mac.com>
In-Reply-To: <20090114181522.GB4487@aurora.oekb.co.at>
References:  <496E06D1.2070706@gmail.com> <20090114181522.GB4487@aurora.oekb.co.at>

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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




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