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Possible Duplicate:
How do interrupts in multicore/multicpu machines work?
what is interrupted by a hardware interrupt? one particular CPU core execution or all CPUs in the system?
The CPU is i7 or Xeon X3450
A hardware interrupt interrupts a single core, depending on SMP affinity. It doesn’t have to be the same core always, i.e. you can process a network packet in a core, and the next one in another core.