[vbox-dev] GOOD News: patch for 48 GiB RAM for guests

Knut St. Osmundsen bird at sun.com
Tue Jul 13 11:30:03 PDT 2010

Alexey Eremenko wrote:
> The current version of VirtualBox (3.2.6) supports up to 16 GiB of RAM per VM.
> FreeBSD community man, HubTou wrote a patch to up the limit to 48 GiB of RAM.
> http://forums.virtualbox.org/viewtopic.php?f=10&t=28215
> I have tested it with 36 GiB of RAM on real hardware (RHEL5 Linux host).
> Host: Dual AMD Opteron Magny-cours (2x12) 24 core + 48 GB of RAM +
> VBox 3.2.6 OSE with HubTou patches.
> It was also tested on FreeBSD 8 host by HubTou.
> the following guest systems were able to boot and work:
> -RHEL-5.4/32-bit (PAE)
> -RHEL-5.4/64-bit
> -Windows Server 2003/x64
> -Windows 7/x64
> -FreeBSD 8.0/64-bit (tested by HubTou)
> On Linux guests I have also put a load - ramdisk (via tmpfs).
> Plus I have done the full "memtest86" test -- and it PASSED after 30 hours.
> After those tests I can recommend to evaluate the patch for inclusion
> into VBox 3.3.x line.
> Please evaluate the patch of 48 GiB RAM for guests.
> TODO: Test Guests: (for someone else)
> -Mac OS X Server
> -Solaris
> -Windows Server 32-bit PAE
> TODO: Test Hosts: (for someone else, unless you provide me with remote
> access into such a machine)
> -Windows
> -Mac
> -Solaris
> TODO: Write: (for someone else)
> -a similar patch for the Qt GUI.
> The patch is in the forum.
> http://forums.virtualbox.org/viewtopic.php?f=10&t=28215
> Forum also includes the VBox Log and my test results.

I explained on the forum why we have kept the limit at 16 GiB:

Feel free to try track down and fix the performance issues, but drop me
a hit first so we don't duplicate any work. :-)


Kind regards / Mit freundlichen Gruessen / Vennlig hilsen,


ORACLE Deutschland B.V. & Co. KG  Knut St. Osmundsen
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