Interrupts do not balance with irqbalance in "exact" IRQ hinting mode

Solution Verified - Updated -

Issue

  • Interrupts do not balance with irqbalance in "exact" IRQ hinting mode

  • IRQs are assigned to unexpected CPU cores or NUMA Nodes when /etc/sysconfig/irqbalance contains:

    IRQBALANCE_ARGS="-h exact"
IRQBALANCE_ARGS="--hintpolicy=exact"

  • NIC driver does not appear to properly provide affinity_hints to for interrupt balancing

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Multi-queue network interface
  • irqbalance with exact hinting policy

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