sharing my thoughts... I agree with you on NUMA penalties. max vCPUs per VM should be limited to cores within a socket How many physical cores do you need to support that 8 vCPU VM? To answer your question, first determine whether VM really needs it? because, if we allocate 8 vCPUs to a VM and if any of the core is not available for scheduling, remaining 7 vCPUs has to wait for the core to be available. This will also degrades VM performance. More vCPUs more risk. Below is the URL from intel which shows vCPUs/Core http://www.intel.in/content/dam/www/public/us/en/documents/white-papers/virtualization-xeon-core-count-impacts-performance-paper.pdf To Calculate average vCPUs/Core in your current environment.. http://enterpriseadmins.org/blog/scripting/general-vsphere-cluster-countsaverages/
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