What happens to a Startup IPI sent to an Active AP that is not in a Wait-for-SIPI state
问题 In a previous Stackoverflow answer Margaret Bloom says: Waking the APs This is achieved by inssuing a INIT-SIPI-SIPI (ISS) sequence to the all the APs. The BSP that will send the ISS sequence using as destination the shorthand All excluding self, thereby targeting all the APs. A SIPI (Startup Inter Processor Interrupt) is ignored by all the CPUs that are waked by the time they receive it, thus the second SIPI is ignored if the first one suffices to wake up the target processors. It is advised