FreeBSD 4.x Opteron Question

[Chuck Robey]

Boris Spirialitious wrote:
> --- Boris Spirialitious <hardcodeharry at yahoo.com>
> wrote:
> 
>>--- Matthew Seaman <m.seaman at infracaninophile.co.uk>
>>wrote:
>>
>>>On Tue, Mar 15, 2005 at 08:50:22AM -0800, Boris
>>>Spirialitious wrote:
>>>
>>>>When opteron support start for Freebsd? I have
>>>
>>>4.9. 
>>>
>>>>is supported? Or 4.11 better? I can't use 5.x.
>>>
>>>Well, AMD64 support as a tier-1 platform only came
>>>in with 5.x, so
>>>you're S.O.L. if you have to use a 4.x release
>>>version.  
>>> 
>>>
>>>>Will a i386 disk boot on opteron system? Can I
>>>>use same disk image for intel and amd MBs? Any
>>>>big problems?
>>>
>>>You can generally run AMD64 machines in IA32 mode
>>
>>--
>>
>>>but what would be
>>>the point? All you get then is a machine that
>>
>>costs
>>
>>>more than an
>>>equivalent IA32 box and that probably performs
>>>worse.
>>
>>That is very curious to say. Isn't the advantage
>>of Opteron the superior IO architecture? There is
>>not much advantage with 64 bit computing. What is
>>faster about it? Pointers are bigger, so it use
>>more cache for less. NOt much 64bit math in
>>OS. Why do you say it will perform worse?

Boris, I am sure you realize that a great deal of the 64 bit IO 
architecture is leveraged from the 64 bit instructions set, that allows 
things like 64 bit fetches.  Will there be a gain without using the 64 
bit instruction set?  Yes.  Will it be as large?  No.

>>
>>Boris
> 
> 
> I am waiting for your answer.
> 
> Boris
> 
> 
> 		
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