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 VMDirectPath requirement questions 
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Joined: Thu Oct 28, 2010 7:20 am
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Post VMDirectPath requirement questions
Been using ESXi for sometime but recently found the need to use the VMDirectPath and start doing research for new/faster hardware.

Please correct me if I'm wrong : I'm aware of VT-d or IOMMU is a feature of the mobo chipset, not CPU, and it's what needed to get VMDirectPath to be enable. Thus I concentrated on searching mobo which BIOS has the VT-d or IOMMU feature listed in their manual. Yet, when I look into intel cpu, all the Core i7-8xx series listed VT-d featured right on the CPU but the newer Core i7-9xx series doesn't.

I was confused about this. If VT-d is a mobo feature, why would the i7-8xx series will also has it ?

1) does it mean if I had chosen the Core i7-8xx CPU (which has VT-d built in) then any mobo will work even the mobo chipset doesn't support VT-d? or
2) VMdirectpath infact need both CPU and mobo to support VT-d to work ? or
3) I'm just thinking too much - back to the basic, choose the mobo which chipset support VT-d, then pick any CPU that fit the motherboard will be okay ?

Any help would be much appreciated ~


Thu Oct 28, 2010 7:45 am
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Joined: Mon Mar 16, 2009 10:13 pm
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Post Re: VMDirectPath requirement questions
VT-d is a chipset requirement. You can't just have a CPU with VT.

http://www.intel.com/support/processors ... 031637.htm

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Dave Mishchenko
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Thu Oct 28, 2010 9:11 pm
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Joined: Thu Oct 28, 2010 7:20 am
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Post Re: VMDirectPath requirement questions
Thank you. Then I shall pick the i7-9xx series and concentrate on finding the right motherboard for my needs.


Thu Oct 28, 2010 9:25 pm
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Joined: Mon Mar 16, 2009 10:13 pm
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Post Re: VMDirectPath requirement questions
When you're looking at MBs I would suggest finding something that has been specifically tested. Gigabyte MBs I would steer away from as some have supported IOMMU (AMD's VT-d) but not worked with ESXi. I'm not sure if it a MB issue or ESXi but for the users with those MB it doesn't matter as it doesn't work.

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Dave Mishchenko
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Thu Oct 28, 2010 9:44 pm
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Joined: Thu Oct 28, 2010 7:20 am
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Post Re: VMDirectPath requirement questions
Thanks Dave, I shall consult this forum and the Vmdirectpath HCL (not much update at that list) and try to locate one that would support Intel Core i7-9xx and the features I need and have been successfully installed by earlier whitebox enthusiast.

I'm an Asus fan also, will primarily focus on that brand.


Sun Oct 31, 2010 9:23 pm
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Joined: Thu Jul 14, 2011 4:45 am
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Post Re: VMDirectPath requirement questions
Hello everybody,
It's a function of the chipset and also a function of the processor, they are working together to provisionning VTd.
We absolutely need a chipset and bios release that supports well VTd, but also a CPU with this function.
Jean-claude


Thu Jul 14, 2011 5:21 am
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