Total DPC Rate is the combined rate at which deferred procedure calls (DPCs) are added to the DPC queues of all processors ...

Total DPC Rate is the combined rate at which deferred procedure calls (DPCs) are added to the DPC queues of all processors between timer ticks of each processor's system clock.  (DPCs are interrupts that run at a lower priority than standard interrupts). Each processor has its own DPC queue. clock on the processor.  This counter measures the rate at which DPCs are added to the queue, not the number of DPCs in the queue.  It is the sum of Processor: DPC Rate for all processors on the computer, divided by the number of processors.  This counter displays the last observed value only; it is not an average.
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