The core in which NAPI is using

Hi, everyone My ethernet card always interrupts at Core 0 . The driver of the device is using NAPI. When NAPI is appled, does the core in which NAPI is processing vary? Is the NAPI triggered by software interrupt, isn't it? My system monitor indicates the CPU loading varies randomly among 8 cores. Can you give an information if the core which NAPI is using varies? Thanks in advance. Best Regards, J.Hwan Kim