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RE: [Xen-users] is Intel VT-d "really" necessary?

To: <rudi@xxxxxxxxxxx>, "'xen-users'" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] is Intel VT-d "really" necessary?
From: "Dustin Henning" <Dustin.Henning@xxxxxxxxxxx>
Date: Wed, 15 Sep 2010 08:32:06 -0400
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Even then, I believe VT-d is for PCI pasthrough, which you say you don't
need even if you do want to run unmodified OSes.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Juergen
Sent: Wednesday, September 15, 2010 05:50
To: xen-users
Subject: Re: [Xen-users] is Intel VT-d "really" necessary?

No, if you dont want to use unmodified os or windows vt doesnt really 

On 09/15/2010 11:20 AM, Rudi Ahlers wrote:
> Hi all,
> I'm just curios and would like some input from the community on this
> one. We're busy budgeting for a couple of new servers and I thought it
> would be good to try out the Core i7 CPU's, but see the majority of
> them don't offer VT-d, but just VT-x. Looking at the LGA1366 range,
> only the "Intel lga1366 i7 980XE" (from the list of what our suppliers
> stock) have VT-d, and it costs 4x more than "Intel lga1366 i7 930" or
> 2x more than "Intel lga1366 i7 960". From a budget perspecitve I could
> purchase 4 more CPU's, which could translate to 40x - 80x more VM's
> being hosted for the same capital outlay. Experience has shown that we
> under-utilize CPU's by a great margin and memory / HDD IO is our
> biggest bottleneck on any server.
> So, if VT-d really necessary?
> We mainly host XEN virtual machine for the hosting industry, i.e. we
> don't need / use graphics rendering inside VM's, or need DAS on the
> VM's, etc.

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