Re: Windows XP Home and hyperthreading
From: R. McCarty (PcEngWork-NoSpam__at_mindspring.com)
Date: 08/22/04
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Date: Sun, 22 Aug 2004 01:15:03 GMT
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.
"root" <postmaster@buchanangc.com> wrote in message
news:uqG50M%23hEHA.3664@TK2MSFTNGP12.phx.gbl...
>
> "Mel Marcovitz" <mel.marcovitz@sympatico.ca> wrote in message
> news:uUzv9D%23hEHA.2880@TK2MSFTNGP10.phx.gbl...
>> 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.
>
>> "root" <postmaster@buchanangc.com> wrote in message
>> news:uvUT9l9hEHA.712@tk2msftngp13.phx.gbl...
>> >
>> > "glenmick" <glenmick@discussions.microsoft.com> wrote in message
>> > news:37631AC6-57A4-42D5-8EC1-50A260A46259@microsoft.com...
>> >> 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.
>
>
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