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From: John Nielsen <lists@jnielsen.net>
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Cc: Philip Radford <pradford@gmail.com>
Subject: Re: FreeBSD 5.4 on a Pentium 4
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On Thursday 08 February 2007 11:16, Philip Radford wrote:
> Hi all,
>
> Just wondering if anyone could help me out with an issue on  FreeBSD which
> has been puzzling me for a while and only now do I have the  time to go and
> figure it out.
>
> We currently have version 5.4 installed  but understand that the
> architecture it is set up for is a generic  i386.
>
> How do I go about optimising my base system and/or installed ports  to
> recognise my CPU as an i686 and therefore make use of this type of  CPU.
>
> I have enclosed the first part of my dmesg output to identify the  CPU.
>
> CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3000.12-MHz 686-class  CPU)
>   Origin = "GenuineIntel"  Id = 0xf41  Stepping = 1
>   
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MC
>A,C MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>    Hyperthreading: 2 logical CPUs

Add "CPUTYPE?=pentium4" to /etc/make.conf.

Remove the "cpu I486_CPU" and "cpu I586_CPU" lines from your kernel config (if 
present), leaving only "cpu I686_CPU". Rebuild your kernel, world, and ports.

JN