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Re: [Xen-users] ååï RE: How to configure win 2003 standard to show multiple CPU?

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Uwe Maier <argn@xxxxxxx>
  • Date: Mon, 8 Oct 2007 07:53:29 -0700 (PDT)
  • Delivery-date: Tue, 09 Oct 2007 05:30:06 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

AFAIK you cannot switch from a non ACPI installation to an ACPI
configuration. All you can do is switch from a single processor machine to a
MPS one. But since the other processors are called into life by ACPI you're

You can try for yourself:
* go into the device manager
* select your uniprocessor there
* change the driver
* select the driver for yourself
=> if you're offered only non ACPI machine types (uniprocessor/MPS) it's
time for a reinstallation

I tried recently to disable the ACPI stuff (tried to find out if it's
responsible for the bad performance) and I was offered four machines there
when coming from ACPI: single processor with and without ACPI, MPS with and
without ACPI.
After I've done the switch there was no way back.


btw. I personally don't see an advantage of using the cpus parameter.

wayne wu wrote:
> this is my config:
> vcpus=4
> pae=1
> acpi=1
> apic=1
> cpus=0-3
> It's a bit strange that in the task manager, there's only 1 item, '1 graph
> per cpu', and it is checked and grey, seems I can not deselect it. 
> James Harper <james.harper@xxxxxxxxxxxxxxxx> åéï > When I install Windows
> Server 2003 Standard Edition on Xen, I didn't
>> configure multicore (vcpus = 1, cpus not set). Now I'd like to fully
>> utilize multicore, but whatever I set, windows task manager can not
> see
>> more than 1 cpu. Do I have to reinstall the OS with vcpus and cpus
> being
>> set properly? Since the image file is licensed, is there any way I
>> configure windows to show multi CPU without reinstalling it? I use a
> quad-
>> core desktop with VTx.
> Have you definitely got task manager in '1 graph per cpu' mode?
> You shouldn't need to re-install 2003 to get it to see added processors,
> I know you had to install a different HAL on NT to go from single to
> multiple processors, but I think that was resolved by Windows 2000.
> You might need ACPI to see the multiple processors though... is that
> enabled in your configuration?
> hth
> James
> ---------------------------------
> éèéçïççääï 
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