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VM VirtualBox -Host XP OS gives only 50% of the CPU resources to the Guest XP OS.

Posted on 2011-03-06
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Last Modified: 2012-05-11
Hi Guys. I am running VM VirtualBox on a Pentium 4 PC. I share 3 GB between Host XP and Guest XP.

I am not asking about slowness because I know you will tell me to move from the Pentium 4 to a better processor.

Host XP OS gives only 50% of the CPU resources to the Guest XP OS.(Comparing from the Windows Task Manager CPU Usage of the 2 XP instances)

Any Ideas why I can`t get all the CPU resources to the Guest OS?

Take care..
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Question by:New_Alex
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Expert Comment

by:Experienced Member
ID: 35046214
You could try VMware Workstation. It has specific settings for priority of the guest machines.

However, a properly built windows machine (host or guest) should run at about 2% CPU at idle. CPU is used only when demanded (at least on my machines). So then if I do something with my XP guest (or Vista guest) it gets the CPU it needs.

VMware Workstation also allows you to manage guest memory. This is a bit different in that the host machine needs memory to work and VMware will normally allot about have the memory to guests but you can allocate more than 50% to guests (but never 100%).  

... Thinkpads_User
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Author Comment

by:New_Alex
ID: 35046315
Thanks thinkpads_

I have tried VMware Workstation though. You are right there are many tweaks available there. But the major problem with VMware that I can not find a workaround is with mouse. The scroll wheel jumps too quickly. 5-6 lines every click.........This is in VMware Workstation...



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by:Experienced Member
ID: 35046358
I never had that problem, and that normally occurs because the VMware Tools have not been installed. If the Tools are installed, you can tweak the mouse, but I never had to do that.

I am using VMware V7 right now and have used every version from V1 through V7. I think I was on V4 with a pentium 4. Version 7 (current) may need more than a Pentium 4. Most modern software does.

Also my comments about CPU usage should apply to any virtualization product. Make sure your guest and host machines are properly set up.

... Thinkpads_User
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Accepted Solution

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New_Alex earned 0 total points
ID: 35072259
This is the solution.....

Pentium 4 HyperThreading is two threads per physical core, creating two logical cores which the OS interprets as two CPUs.

Despite VirtualBox, VMware can see these 2 cores in the host. You will need to assign 2 processors to the Guest in order to get the full out of your processing power !!!

That solved the problem.....


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Author Closing Comment

by:New_Alex
ID: 35120668
Simply because this is the only right answer matey.....So accept it and don't ask too much !!!!!
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