Dual monitor with 3d acceleration = poor performance

lordveovis · Post by **lordveovis** » 24. Oct 2014, 19:40

I am having a major performance hit to general processing when I have dual monitor setup with 3d acceleration enabled. If I have a single display I have no performance loss, nor do I notice it with dual diplay and no 3d acceleration enabled. The problem is I have several programs that require 3d acceleration in order to even run properly. What can I do to improve performance?

My host system is SUSE Linus Enterprise Desktop 11.3 with a quad core Xeon, 48GB RAM, Nvidia Quadro 2000, and 1TB PCIe SSD so the host should not be introducing any slowness.

Post by **loukingjr** » 24. Oct 2014, 19:51

Please attach the vbox.log for the guest in question.

lordveovis · Post by **lordveovis** » 24. Oct 2014, 20:08

Here is the most recent log.

Edit: The most recent boot has 3d disabled again since it has such poor performance when enabled.

lordveovis · Post by **lordveovis** » 26. Oct 2014, 22:03

Anyone have any thoughts on this? Does no one else see this kind of behavior?

Post by **loukingjr** » 27. Oct 2014, 08:16

lordveovis wrote:Anyone have any thoughts on this? Does no one else see this kind of behavior?

Someone might but you have to hope that someone is running a SUSE host AND is running dual monitors. Might take awhile.

lordveovis · Post by **lordveovis** » 27. Oct 2014, 14:56

Does no one else have this problem with other Linux hosts with dual monitor, 3d accel, Win 7 guest?

Post by **loukingjr** » 27. Oct 2014, 15:11

Looking at your log this morning, you have 6 cores assigned to your W7 guest.

Code: Select all

00:00:00.727784   NumCPUs         <integer> = 0x0000000000000006 (6)

Try reducing it to 2 cores.

lordveovis · Post by **lordveovis** » 27. Oct 2014, 17:22

This had a significantly negative effect on performance. I was about 2-3 times as long to do anything, open programs, start the OS, etc.

lordveovis · Post by **lordveovis** » 27. Oct 2014, 17:57

This led me to set it for 5 processors and this seems to be closer to equal performance, I will use it for now and get back, but I do not think it is completely resolved, just less noticeable with only 5 of the 6 cores passed through.

lordveovis · Post by **lordveovis** » 27. Oct 2014, 19:39

I had initially thought that there was a performance increase, but it seems to be about the same. I seem to have about a 20% performance difference between 1 display and 2.

virtualbox.org

Dual monitor with 3d acceleration = poor performance

Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance

Re: Dual monitor with 3d acceleration = poor performance