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Date: Wed, 16 Oct 2002 11:14:05 -0700
From: Samuel Flory <sflory@rackable.com>
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CC: Mark Cuss <mcuss@cdlsystems.com>, linux-kernel@vger.kernel.org
Subject: Re: Kernel reports 4 CPUS instead of 2...
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Richard B. Johnson wrote:

>On Wed, 16 Oct 2002, Samuel Flory wrote:
>
>  
>
>>>On Wed, 16 Oct 2002, Mark Cuss wrote:
>>>
>>> 
>>>
>>>
>>>This is the correct behavior. If you don't like this, you can
>>>swap motherboards with me ;) Otherwise, grin and bear it!
>>>
>>> 
>>>
>>>      
>>>
>> 
>>  Wouldn't it be easier just to turn off the hypertreading or jackson 
>>tech option in the bios ;-)
>>
>>    
>>
>
>Why would you ever want to turn it off?  You paid for a CPU with
>two execution units and you want to disable one?  This makes
>no sense unless you are using Windows/2000/Professional, which
>will trash your disks and all their files if you have two
>or more CPUs (true).
>
>  
>

  Actually I can think of 3 obvious reasons:

1)Your app is cache bound, and not cpu bound.
2)Your system tends to only run 1 or 2 non thread activities at a time.
3)You don't trust hyperthreading.


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