Processor(s) Unselectable

This is for discussing general topics about how to use VirtualBox.
Post Reply
DNS
Posts: 107
Joined: 2. May 2011, 00:16
Primary OS: MS Windows 7
VBox Version: VirtualBox+Oracle ExtPack
Guest OSses: xp win7

Processor(s) Unselectable

Post by DNS »

Hi. On the current pc I have a core duo2. The processor settings dialogue in Vbox can only see 1, and doesn't allow me to select the max: (2 in this case). Is there something wrong or thats the way it works? I've noticed when running vmware player that there the 2 cores could be selected. So I'm wondering if it just appears that they are or if the other program is also using 1 processor.

AFAIK vbox's SMP support means more physical cpus can be used for the vm. Correct am I?

Your input is appreciated.
stefan.becker
Volunteer
Posts: 7639
Joined: 7. Jun 2007, 21:53

Re: Processor(s) Unselectable

Post by stefan.becker »

At first your machine (CPU+Bios) must have VT.

At second it makes no sense, because you are running 2 os and not one.
DNS
Posts: 107
Joined: 2. May 2011, 00:16
Primary OS: MS Windows 7
VBox Version: VirtualBox+Oracle ExtPack
Guest OSses: xp win7

Re: Processor(s) Unselectable

Post by DNS »

Thanks for the reply. So that means that 1 processor is the maximum that each OS oculd have? So the workload cannot be shared by 2 processors like any other program? I'm sorry for the questions but I'm a little confused.
BillG
Volunteer
Posts: 5106
Joined: 19. Sep 2009, 04:44
Primary OS: MS Windows 10
VBox Version: VirtualBox+Oracle ExtPack
Guest OSses: Windows 10,7 and earlier
Location: Sydney, Australia

Re: Processor(s) Unselectable

Post by BillG »

That is correct. If your hardware and BIOS do not support hardware virtualization, you can only run one processor per vm.

But if you are running two vms and the host OS you are already running three OSs. Giving one vm two processors whould not really be much of a benefit. You two processors are already stretched.
Bill
Post Reply