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XP Performance in Hyper-V

I’ve found that Windows XP with more than 1GB of memory and multiple processors has some pretty terrible performance issues. I’ve also noticed that XP images that have been converted from a physical machine are even worst. There are many things to check for (Physical processor version on the host, make sure you have a single core and run the image with 512 or 1024MB of memory etc)

Another performance tip is to configure the ACPI Multiprocessor PC HAL to a ACPI Uniprocessor PC HAL: When using P2V migration images that had multi-core physical processors. In my experience Hyper-V integrated components says it is changing the HAL type, but does not.

You can download Microsoft’s DevCon command line utility to change the ACPI type without re-installing the Operating System.

The commands I used were:

devcon sethwid @ROOT\ACPI_HAL000 := +acpiapic_up !acpiapic_mp
devcon update c:\windows\inf\hal.inf acpiapic_up

Hope this helps and happy physical to virtualization migrations with XP.

4 Comments Post a comment
  1. Meitzi #


    Correct command:
    devcon sethwid @ROOT\ACPI_HAL000 := +acpiapic_up !acpiapic_mp
    devcon update c:\windows\inf\hal.inf acpiapic_up

  2. Meitzi #

    so this forum will mess up.
    ITs ” HAL \ 0000 ” without space.

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