This INTEGER reports processor interrupts per second, per 'Processor interrupts/sec.' On a network security appliance, interrupt rate closely tracks packet-per-second load from the NICs, so an unusually high interrupt rate with only moderate procUsage could hint at inefficient interrupt handling or a NIC driver issue rather than genuine traffic-processing load. A sudden doubling of interrupts/sec without a corresponding rise in real traffic volume would point toward a NIC or driver problem generating excess interrupts.