What point do I pay attention to when I increase CPU core and is there difference between virtual and physical?

Solution Unverified - Updated -

Issue

I want to increase CPU core. Is there any careful point? or is there any difference between virtual and physical?

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • i386, i686, x86_64 environment

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