BIOS - Intel VT for Directed I/O (VT-d) - should I enabled it or leave it disabled? A few questions . . .

[thewul]

Asus X99 DeLuxe/USB.3.1

Current BIOS v3505

Under: Advanced-->System Agent Configuration-->Intel VT for Directed I/O (VT-d)

Intel VT for Directed I/O (VT-d) reads Disabled.

Three questions:

1.  Should I enable this and if so why?

2. Within VMware->Virtual Machine Settings->Hardware-Processors

    Virtualization Engine is set to 'preferred mode: automatic (greyed out) and Disable acceleration for binary translation is UNtagged.

    Should I change these settings and if so to what?

3. Does this have any effects on the graphics with VM ?

see: https://communities.vmware.com/message/2698666#2698666

title: Different graphics and colors between Host and VM Windows 10 x64

Thanks!

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[bluefirestorm · Accepted solution]

Intel VT for Directed I/O (VT-d) reads Disabled.

Three questions:

1.  Should I enable this and if so why?

There should be no harm in enabling it although it would be of no impact, as far as I know with VMware Workstation. VT-d is only required if I/O passthrough is required and currently installing ESXi as the hypervisor on the host would be able to take advantage of it. The 2017 Tech Preview has a "virtualize IOMMU" option but that something in the future.

2. Within VMware->Virtual Machine Settings->Hardware-Processors

    Virtualization Engine is set to 'preferred mode: automatic (greyed out) and Disable acceleration for binary translation is UNtagged.

    Should I change these settings and if so to what?

It is best to keep it automatic. As far as I know it is only greyed out when the VM is powered on. If I am not mistaken, the binary translation is for older processors and this was the mode when VT-x was not yet a feature within the Intel processors.

3. Does this have any effects on the graphics with VM ?

see: https://communities.vmware.com/message/2698666#2698666

Most likely it has no effects on the colour problems.

[vijayrana968]

Details of what is it and when you should enable it or not Understanding VT-d: Intel Virtualization Technology for Directed I/O | Intel® Software

Since you have have NVDIA graphics device, you should check enabling this with passthrough mode to VM.

[thewul]

bluefirestorm​

Thanks again!

As it looks now, the matter is solved.

Am really happy with the solution. Spent quite some time on trying to figure this out myself.

I believed it was a matter of synchronizing between Windows on host and VM.

Then I thought that maybe this Intel VT for Directed I/O had something to do with this.

Hence this post.

So, as for now,  I think I leave this setting as it is.

Currently no reason for a change.

Again thanks!

=

[thewul]

Hello vijayrana968

see my earlier post: matter is solved sofar.

so I think I am not going to do any changes on this setting right now.

Maybe it might be necessary one time in future. Will see.

anyway, thanks for commenting.

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