Date: Wed, 01 Mar 2006 04:51:04 -0600 From: Derek Ragona <derek@computinginnovations.com> To: Steel City Phantom <scphantm@yahoo.com>, freebsd general questions <freebsd-questions@freebsd.org> Subject: Re: Choosing cpu type when building kernel (stupid one i know) Message-ID: <6.0.0.22.2.20060301044340.026155a0@mail.computinginnovations.com> In-Reply-To: <44054987.4080504@yahoo.com> References: <44054987.4080504@yahoo.com>
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The kernel config file details what support is built into the
kernel. However, what instruction set and how the instructions are built
are dependent on the compiler options which are set in /etc/make.conf
I have:
CPUTYPE=pentium4
In one server that has a Pentium 4's /etc/make.conf so gcc builds
everything using the full Pentium 4 instruction set.
-Derek
At 01:13 AM 3/1/2006, Steel City Phantom wrote:
>in bsd 6, i have to recompile the kernel to add atapicam. ok, fine.
>the part of the config file that gets me is this:
>
>machine i386
>cpu I486_CPU
>cpu I586_CPU
>cpu I686_CPU
>ident GENERIC
>
>
>the machine i386, i get. all intel PC's since the 386 have used a common
>basic instruction set and the developers just want to build in something
>in case intel pulls an Apple Computer on us.
>the rest is what i don't understand. 486 isn't mentioned in the NOTES
>file, 586 is just pentium, and 686 is pentium pro. I have a P4 1.4 gig
>intel chip in my system, what should these settings be? if i remove 486
>and 686 does that give me any performance advantage or are these settings
>defaults because they are ment to be defaults and i should just be quiet
>about it.
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