I was hoping to run virtual server on windows XP and be able to create about
12 machines (256 * 12) and leave 1GB for the OS.

However, even removing the /3GB switch and using the /PAE does not allow
Windows to see more then 3.25GB. I have changed the setting in the BIOS to
remap the devices so windows can use the whole 4GB but still nothing.

Thanks.

Virtual PC 2007 runs on x64 and will let you allocate lot of RAM to your VMs.

--PA


"Viperv10" wrote:
> I was hoping to run virtual server on windows XP and be able to create about
> 12 machines (256 * 12) and leave 1GB for the OS.
>
> However, even removing the /3GB switch and using the /PAE does not allow
> Windows to see more then 3.25GB. I have changed the setting in the BIOS to
> remap the devices so windows can use the whole 4GB but still nothing.
>
> Thanks.
>
>
>

Windows XP only has 4GB addressing space and hardware interface
addresses have to come out of that area. On your system that appears to
leave about 3.25 GB that is usable as actually usable memory space. Op
system uses 2 and User space is 2. and the /PAE is for servers but at
best limit the kernal to 1 GB menor and the user space to 3 GB.

http://www.microsoft.com/whdc/system...AE/PAEdrv.mspx

Viperv10 wrote:

> I was hoping to run virtual server on windows XP and be able to create about
> 12 machines (256 * 12) and leave 1GB for the OS.
>
> However, even removing the /3GB switch and using the /PAE does not allow
> Windows to see more then 3.25GB. I have changed the setting in the BIOS to
> remap the devices so windows can use the whole 4GB but still nothing.
>
> Thanks.
>
>

On Tue, 13 Feb 2007 23:41:20 -0500, "Viperv10"
<(E-Mail Removed)> wrote:

>I was hoping to run virtual server on windows XP and be able to create about
>12 machines (256 * 12) and leave 1GB for the OS.
>
>However, even removing the /3GB switch and using the /PAE does not allow
>Windows to see more then 3.25GB. I have changed the setting in the BIOS to
>remap the devices so windows can use the whole 4GB but still nothing.

That must be the limit imposed by the hardware you have installed.

The problem is you have only 4gb of addresses. Various things get
mapped into that space, notably the video memory. Any space mapped to
something else isn't available for memory.

I've got a laptop that won't go above 2.8gb due to this.

Hello,

Thank you for posting in the Microsoft newsgroup!

From your post, my understanding on this issue is: you can use less memory
than you expected. If I'm off base, please feel free to let me know.

Thanks everyone for their key in.

It's very hard to know the exact number of how much memory the system will
use.

For example, if you have 3GB memory for VS, you may have to know how much
of them will be used by the VS system then you can assign the left for the
virtual machines.

In addition, hardware like video card will map part of the system memory as
video memory's extension (if you have an integrated video card, it use
system memory as video memory). The BIOS will map system memory as well.

I suggest you refer to motherboard's manual and set a smaller memory map in
CMOS (or disable mapping if you can) and test again. Based on your
hardware, the settings you changed in CMOS may cause a performance loss.

By my experience on Virtual Server, a large memory assignment certainly can
increase the performance of virtual machine. However, a faster processor is
more important (I assign 128MB memory to Windows XP all the time).

Please let me know if you have any other concerns, or need anything else.

Sean Cai, MCSE2000
Microsoft Online Support

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R: The cu had 2.8g memory in Vista with 4g memory installed
A: N/A
C: Chipset limitation
R: provided information on this issue

close as nan