Re: [gentoo-amd64] Upgrade from single to dual core CPU

[Mark Haney]

Matthias Wolle wrote:
> Am Mittwoch, 25. Januar 2006 20:25 schrieb Sebastian Redl:
>
>> Matthias Wolle wrote:
>>
>>> You are right! AMD licenced HT-Technology from Intel.
>>> AMD Dual Core CPU's uses this to fake a HT-CPU.
>>>
>> "Fake"? Hyperthreading is just a fancy word for what AMD's "Dual Core"
>> describes much better: these CPUs have multiple cores, i.e. instruction
>> handlers, that share the integer, floating point etc. units. The idea is
>> that, since in a conventional CPU all but one of these units are idle at
>> all times, multiple cores could make better use of the CPU.
>>
>> Sebastian Redl
>>
>
> I dont want to contradict!
>
> the german wikipedia writes (http://de.wikipedia.org/wiki/AMD_Athlon_64_X2):
>
> "Der Athlon 64 X2 gibt sich als Hyper-Threading-fähig aus und kann dadurch von
> diversen Optimierungen profitieren,..."
>
> "The Athlon 64 X2 masquerade as hyperthreading capable to benfit from
> hyperthreading optimizations."
>
> I didnt recheck this information with AMD official papers.  Now I did and I
> could not found anything about ...
>
> I wrote the author of this sentence to get his source of information.
>
> greets
> Matthias
>
>
FWIW, Hyerthreading is not the same as Dual Core.  HT still occurs on a 
single processor core, it's the branch prediction and the pipelining 
that lets a single core act more like a dual CPU.  A dual core system 
has two sets of pipelines, instruction sets and branch prediction 
registers, in effect the exact design of a two CPU system on one die.  
Hyperthreading is sort of a halfway point between a single and a dual core.


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Mark Haney
Sr. Systems Administrator
ERC Broadband
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