multiple vCPU vs cores per socket

[beckhamk]

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.

[a_p_ · Accepted solution]

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

André

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[AntonVZhbankov]

>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.

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

http://blog.vadmin.ru

[beckhamk]

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.