Thank you for reading my questions.
Ethernet occasionally interrupts slowly when the host computer sends a frame of 1024 bytes, and many times it takes a few frames to enter, sending it multiple times will interrupt it several times.
Excuse me this is what reason, why can't send once enter quickly?
Could you please clarify what you mean by 'interrupts slowly'? Also, what are you seeing in interrupt status register? How did you configured the interrupt and when should be triggered?