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  • 1.  multiple vCPU vs cores per socket

    Posted Dec 07, 2010 04:18 PM

    I would like to gather opinions on the topic of mutliple vCPU vs cores per socket.

    I am trying to determine if you get the same performance from a 2 x vCPU vm VS a 1 x vCPU x 2 cores vm?

    Thanks in advance.



  • 2.  RE: multiple vCPU vs cores per socket
    Best Answer

    Posted Dec 07, 2010 06:07 PM

    There is no difference in performance, only a difference in the presentation to the guest OS.

    André

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  • 3.  RE: multiple vCPU vs cores per socket

    Posted Dec 08, 2010 07:54 AM

    >I am trying to determine if you get the same performance from a 2 x vCPU vm VS a 1 x vCPU x 2 cores vm?

    Absolutely the same. This is just a way to present CPU cores to guest OS / applications for licensing purposes. For example, Windows XP does not allow more than 2 CPUs. By default all cores are presented as multiple CPUs single core each. But if you have 1 quad CPU and you want to give full power to your VM?

    Technically in standard SMP system there is no difference for guest OS between multiple CPUs and multiple cores.


    ---

    MCITP: SA+VA, VCP 3/4, VMware vExpert

    http://blog.vadmin.ru



  • 4.  RE: multiple vCPU vs cores per socket

    Posted Dec 08, 2010 12:49 PM

    ok.. thanks i had to check. As we ran a test with 1 proc and 2 cores and could easily peg the cpu with the cpu.vbs script and i was surprised the cpu wasnt just humming at around 70% or so. But completely maxed. But i know the vm will have more threads available.