How to change smp_affinity of IRQs assigned to PCI MSI/MSI-X

Solution Unverified - Updated -

Issue

  • Cannot modify /proc/irq/IRQ_NUMBER/smp_affinity:

    # echo 2 > /proc/irq/45/smp_affinity
    "bash: echo: write error: Input/output error"
    
  • irqbalance does not work even when providing a mask of CPUs.

Environment

  • Red Hat Enterprise Linux 7

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