Quad Core host with hyper-threading, how many processors to configure in VirtualBox?

Posted by Anthony on Super User See other posts from Super User or by Anthony
Published on 2013-11-01T09:29:10Z Indexed on 2013/11/01 10:00 UTC
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virtualbox

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virtual-machine

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cpu

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hyper-threading

I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which is true) and that this may cause a performance issue. But hyper-threading is a hardware feature, so the OS sees 8 cores and it sends instructions to all 8. What if setting it to 4 caused the VM to use 2 cores (4 threads) instead of 4 simultaneous threads (on all 4 cores)? Does the warning I got take into account that my machine has hyper-threading?

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