VirtualBox Graphic User Interface Version 4.1.2_Ubuntu r38459 (installed with Ubuntu Software Center)

Host OS: Ubuntu 11.10
Guest OS: Windows XP sp 3 (with guest additions installed)

I have search on Google about this topic but not find any help yet. I read some topic that say VirtualBox v 4 now support dynamic RAM allocation but I do not know how to enable this feature.

Can you show me how to enable it?

1 Answer 1


The feature you are searching for is called Memory Ballooning: http://www.virtualbox.org/manual/ch04.html#guestadd-balloon

  • 1
    Can you describe how exactly? And does this make the guest OS have more memory for it's running applications?
    – trusktr
    Jun 26, 2013 at 17:35
  • As I understand it, running a VM that allows Memory Ballooning (requiring a setting and VirtualBox Guest Additions), a user can send a command to that VM to increase its memory allocation. Note that this does not mean you can allocate 5 GB of memory to two VMs with only 8 GB of RAM (i.e. Memory Overcommitment). And the user must issue the command; it doesn't happen automatically, though I'm sure a clever user could configure performance polling scripts to query the VMs and issue the commands dynamically.
    – palswim
    Jan 15, 2020 at 19:15

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