VirtualBox

Ticket #12742 (closed defect: obsolete)

Opened 8 years ago

Last modified 9 months ago

Very slow performance when using multiple cores

Reported by: nyahoo Owned by:
Component: other Version: VirtualBox 4.3.8
Keywords: multiple CPU, Perfformance Cc:
Guest type: Windows Host type: Windows

Description

Hi,

I am trying to use Virtualbox to run a Windows Server 2012 guest on a Windows Server 2012 R2 host, which has two 6-core xeon processors and 64Gb Ram, with 2 seagate constellation disks in RAID 1.

We have moved over a VM from our desktop (core i7) environment as a test, where it works fine with 4 cores set, and the VM runs incredibly slowly when given anything more than 1 core for its number of CPUs setting. I have attached a log files of 1core and 6core startup/shutdown of a standard Windows Server 2012 install with MS SQL as an example. The 1 core machine boots up in about 15 seconds, whereas the 6 core version takes well over 2 minutes, and then is still slow once startuo completes. Does Virtualbox have an issue with this type of CPU and multiple processors? It is affecting our ability to use it as a development environment

Attachments

Win2012-SP2013-2014-02-26-21-10-39-6-cores Download (107.0 KB) - added by nyahoo 8 years ago.
Record of boot of VM when number of cores is set to 6 (in a 12/24 core physical machine)
Win2012-SP2013-2014-02-26-21-15-31-1-core Download (92.4 KB) - added by nyahoo 8 years ago.
Record of boot of VM when number of cores is set to 1 (in a 12/24 core physical machine)

Change History

Changed 8 years ago by nyahoo

Record of boot of VM when number of cores is set to 6 (in a 12/24 core physical machine)

Changed 8 years ago by nyahoo

Record of boot of VM when number of cores is set to 1 (in a 12/24 core physical machine)

comment:1 Changed 7 years ago by jarrednicholls

It seems that this multiple-CPU issue has been around for years. I am too having the same issue, on Windows 8.1 64-bit machine running on a Mac Pro Host machine w/ OS X 10.9.4. I had this same issue over 2 years ago with VirtualBox 4.1, then w/ 4.2, and still with 4.3.16. When is this going to ever be resolved!?

I've decided to use Parallels and it's lightyears better, albeit I can only go up to 8 cores I believe.

Last edited 7 years ago by jarrednicholls (previous) (diff)

comment:2 Changed 5 years ago by aeichner

  • Status changed from new to closed
  • Resolution set to obsolete

Please reopen if still relevant with a recent VirtualBox release.

comment:3 Changed 9 months ago by Anonymous User

I use VirtualBox 6.1.16 on Windows 10 20H2 to run dev VM downloaded from Microsoft(win10), on intel i7-10700 with 16 cores. VM is configured with 4gb ram, other settings seem to not matter, eg paravirtualization interface, chipset or ram. There is no paging file. Visual settings are set for performance. Search indexing turned off. Windows defender turned off. If VM is started with 4 "CPUs" then it is very responsive. If 8 CPUs - quite slow, eg you have to wait for Start Menu to open. Or you have to wait for menu to appear after you click on taskbar.

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