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afterdawn.com > forums > pc hardware > other pc hardware > why does device manager show 2 cpu's?
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Why does device manager show 2 CPU's?
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kiwi1
Member
_ 		3. February 2007 @ 12:39 _ Link to this message    Send private message to this user   
Hi. I've just noticed Both windows and linux list two CPU's in my comp, linux even gives a different bogomips number for CPU #2. screenshots- http://imagegrotto.com/collection-1167
The problems is, I dont have two CPU's or a dual core.
I have a P4 2.93ghz
Just wondering why there's two of em?
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This message has been edited since posting. Last time this message was edited on 3. February 2007 @ 12:41
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gtjr_ph
Member
_ 		4. February 2007 @ 02:59 _ Link to this message    Send private message to this user   
maybe hyperthreading is enabled
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BigDK
Senior Member

3 product reviews
_ 		4. February 2007 @ 03:46 _ Link to this message    Send private message to this user   
You have dual core P4
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hangfire1
Newbie
_ 		4. February 2007 @ 04:14 _ Link to this message    Send private message to this user   
Originally posted by kiwi1:
Hi. I've just noticed Both windows and linux list two CPU's in my comp, linux even gives a different bogomips number for CPU #2. screenshots- http://imagegrotto.com/collection-1167
The problems is, I dont have two CPU's or a dual core.
I have a P4 2.93ghz
Just wondering why there's two of em?
You have Hyper Threading enabled. With this enabled your OS sees two logical processors instead of one physical processor. On Windows, if you use Task Manager, you will see the CPU usage of each processor report different usage levels. Same should be true in linux but knowing very little about linux I have no idea how you would go about observing this.

If you want to disable HT you'll need to do this from the BIOS.
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Wilbow
Suspended due to non-functional email address
_ 		4. February 2007 @ 14:30 _ Link to this message    Send private message to this user   
Would you want to disable Hyperthreading for any reason?
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hangfire1
Newbie
_ 		5. February 2007 @ 03:02 _ Link to this message    Send private message to this user   
Originally posted by Wilbow:
Would you want to disable Hyperthreading for any reason?
Perhaps. I am not 100% sure but it is possible that some apps don't like HT. I know that when I flash my DBOX2 I get a warning that HT may prevent things from working - it has always worked for me however.

HT enabled draws more power from your power supply so I suppose if you have a naff under rated power supply it might be an idea not have it enabled. The safety features of the power supply 'should' protect the processor if anything goes wrong (I use the word 'should' because it might not) As it draws more power from the power supply obviously the power supply draws more power from the mains so it will cost more to run you PC, I doubt you'll notice it much on your utility bill though!

Best leaving it on, everything runs faster and if you want to experiment (be careful though) you could try playing with processor affinity. This is where you tell a process to use either of the virtual CPU's or both.
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