Windows XP Home and hyperthreading

[Guest]

I just upgraded to a new Intel motherboard and processor with Hyperthreading
(HT), but I don't think XP Home recognizes it. It's enabled in BIOS and there
are two processors listed in Device Manager, but the CPU Usage History in
Task Manager shows only one graph instead of two. How do I get XP Home to
recognize HT?

 

[Drew Tognola]

Glen/Mick.

I'm not familar with HT but did find an article from a couple years ago,
though it might be updated by now.

http://www.winnetmag.com/Article/ArticleID/26616/26616.html

Drew

 

[Ron Martell]

I just upgraded to a new Intel motherboard and processor with Hyperthreading
(HT), but I don't think XP Home recognizes it. It's enabled in BIOS and there
are two processors listed in Device Manager, but the CPU Usage History in
Task Manager shows only one graph instead of two. How do I get XP Home to
recognize HT?

When you upgraded did you reinstall XP or are you still using the same
installed copy you had with the old motherboard?

You may need to do a Repair Install if you didn't reinstall. See
http://michaelstevenstech.com/XPrepairinstall.htm for detailed
instructions.

Good luck


Ron Martell Duncan B.C. Canada
--
Microsoft MVP
On-Line Help Computer Service
http://onlinehelp.bc.ca

"The reason computer chips are so small is computers don't eat much."

 

[Francis]

Actually, I think you may have your task manager set as: One Graph per CPU.

Francis

 

[root]

I just upgraded to a new Intel motherboard and processor with Hyperthreading
(HT), but I don't think XP Home recognizes it. It's enabled in BIOS and there
are two processors listed in Device Manager, but the CPU Usage History in
Task Manager shows only one graph instead of two.

Why would you expect two graphs?

How do I get XP Home to
recognize HT?

You already said that it HAS recognized it.

 

[Mel Marcovitz]

Hi;

As I understand, hyper is suppose to convince the operating system that
there are 2 cpu's present in the computer. Windows XP home edition only
recognizes 1 cpu. whereas Windows XP Professional recognizes more than 1
cpu.

Hope this helps.

 

[root]

Hi;

As I understand, hyper is suppose to convince the operating system that
there are 2 cpu's present in the computer.

Half way.

Windows XP home edition only
recognizes 1 cpu. whereas Windows XP Professional recognizes more than 1
cpu.

The OP said two CPUs appeared in Device Manager.

 

[R. McCarty]

Hyperthreading depends on several things:
1. Hyperthreading is enabled in BIOS
2. XP is installed using the ACPI Multiprocessor HAL
(Hardware Abstraction Layer)
Can be verified by expanding the Computer category
in Device Manager.
If you only see one graph, not a split view then Taskmgr
is only seeing a single processor.
Changing HAL's is usually done with a Repair Install. It is
possible to manually define to the install which HAL to use.
Most likely your XP instance was originally just the simple
ACPI (Single) processor HAL, so the Hyperthreading is
not utilized.

 

[Guest]

Thanks, Ron. I did not reinstall XP; I'm still using the same copy. I just
downloaded and installed SP2, but that didn't fix it. Isn't a repair install
risky and tricky? Is it worth it?

 

[Guest]

Hey, Ron (and all): I decided to throw caution to the wind and do a repair
install of XP...and it worked. I now have two graphs and am in HT heaven!

Thanks

Glen

******************************************************

 

[Ron Martell]

Hey, Ron (and all): I decided to throw caution to the wind and do a repair
install of XP...and it worked. I now have two graphs and am in HT heaven!

Thanks

Glad to hear that things worked out okay for you.

Good luck


Ron Martell Duncan B.C. Canada
--
Microsoft MVP
On-Line Help Computer Service
http://onlinehelp.bc.ca

"The reason computer chips are so small is computers don't eat much."