Re: Turning Hyperthreading on/off with XP
- From: "Yasoo" <Yasoo@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 12 Oct 2005 20:19:01 -0700
Thanks guys.
""Darrell Gorter[MSFT]"" wrote:
> hello,
> That's not actually correct.
> When you install the machine, setup tries to make a detemination whether
> the machine is PIC or APIC.
> If the motherboard is multi-processor aware, it should install the APIC
> hal, even with a single processor.
> Enabling hyperthreading in the bios after the fact and rebooting should
> autodetect the second processor and make any changes.
> Enabling or disabling hyperthreading should not change the fact that the
> motherboard is APIC.
> As long as APIC is detected it should work properly.
> Unless there is an option in the bios to change from PIC to APIC or from
> APIC to PIC, enabling hyperthreading or disabling hyperthreading in the
> bios should not prevent the OS from recognizing the changes.
> However if HAL is forced during setup using the F5 key, then the
> auto-update is disabled for future changes.
> If setup does not correctly detect the motherboard as APIC, it will not
> reflect the changes either.
> Thanks,
> Darrell Gorter[MSFT]
>
> This posting is provided "AS IS" with no warranties, and confers no rights
> --------------------
> <From: "R. McCarty" <PcEngWork-NoSpam_@xxxxxxxxxxxxxx>
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> <FF3040FC-4FDE-47D9-8B46-261BAA53BB75@xxxxxxxxxxxxx>
> <Subject: Re: Turning Hyperthreading on/off with XP
> <Date: Wed, 12 Oct 2005 20:07:10 -0400
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> <
> <You can turn off Hyperthreading in the BIOS and the Multiprocessor
> <HAL will continue to work. However, if you installed with a "Single"
> <CPU HAL like ACPI (without Multiprocessor) and then turn on the
> <Hyperthreading in BIOS, XP will continue to see/use only a single CPU.
> <So it works one way and not the other.
> <
> <"Yasoo" <Yasoo@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> <news:FF3040FC-4FDE-47D9-8B46-261BAA53BB75@xxxxxxxxxxxxxxxx
> <> O.K. :) That's 2 replies - one says I can do it, the other says I
> can't.
> <> :) Now what?
> <>
> <> "Sparda" wrote:
> <>
> <>> "" wrote:
> <>> > Can I reboot XP, turn hyperthreading on/off in the BIOS, boot
> <>> > back into XP
> <>> > and XP with see that hyperthreading is either on/off and run
> <>> > accordingly? Or
> <>> > are there other settings or things to take into consideration?
> <>>
> <>> You probably don;t want to do this, as windows XP (unpon instalation)
> <>> will have configured itâ?Ts self for two CPUs (Since when hyper
> <>> threading is enabled it treats them as two CPUs). So turning it off
> <>> with out reinstalling windows will probably result in system
> <>> instability in the best situation.
> <>>
> <>> --
> <>> Posted using the http://www.windowsforumz.com interface, at author's
> <>> request
> <>> Articles individually checked for conformance to usenet standards
> <>> Topic URL:
> <>>
> http://www.windowsforumz.com/General-Discussion-Turning-Hyperthreading-XP-ft
> opict431889.html
> <>> Visit Topic URL to contact author (reg. req'd). Report abuse:
> <>> http://www.windowsforumz.com/eform.php?p=1450217
> <>>
> <
> <
> <
>
>
.
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