CPU pinning with Hyperthreading and NUMA

Solution Unverified - Updated -


  • Need clarification on the effect of CPU Hyperthreading enabled at BIOS level with CPU pinning at the Hypervisor level
  • Consider a system with:
    • 4 Sockets
    • 8 Cores
    • 2 Threads
  • Using CPU pinning
  • Requires NUMA boundaries to be respected
  • Is CPU allocation done on a Core level (0-31) or on a Thread Level (0-63)?
  • Is there a performance benefit to disabling Hyperthreading at the BIOS level?
  • Does Red Hat and RHEVM account for Hyperthreading behind the scenes?


  • Red Hat Enterprise Virtualization (RHEV) 3.2
  • Red Hat Enterprise Virtualization (RHEV) 3.3
  • Red Hat Enterprise Virtualization (RHEV) 3.4

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