Windows HyperV 2012 R2 -- enable HyperThreading & Turbo ?

Posted on 2015-02-18
Medium Priority
Last Modified: 2015-03-10
Some articles say "enable Hyperthreading if the resulting # of total cores would be equal to or less than maximum number Hyper-V server supported"

Is this true ?
If not, what is recommended ?
Question by:finance_teacher
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Accepted Solution

Philip Elder earned 2000 total points
ID: 40617195
I have an E-E Article that pretty much covers this and more: Some Hyper-V Hardware and Software Best Practices.

We leave Hyper-Threading alone in the BIOS. We disable C-States that have an impact on server performance.

When assigning vCPUs to VMs we consider physical cores only in that assignment essentially ignoring the virtual cores presented by Hyper-Threading. In our testing enabled or disabled did not make too much of a performance difference.

Author Comment

ID: 40617741
So it sounds like there is NO reason to purchase a Hyperthread processor for a Hyper-V host, correct ?
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by:Philip Elder
Philip Elder earned 2000 total points
ID: 40617762
AFAIK all processors but the very entry-level ones have Hyper-Threading. The minimum spec CPU we'd deploy would be at least an E5-2620 vX series and up (mainstream line).

It's almost pointless to deploy E5-260x vX given their performance limitations on so many fronts.

In our experience GHz is King. So, purchase a faster processor over more cores is our rule of thumb with very few exceptions.

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