Rk3399 platform development series explanation (network debugging) 7.30. What will affect the sending process of TCP packets?

platform	Kernel version	Android version
RK3399	Linux4.4	Android7.1

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Let's look at some in this chapter TCP Some problems we often encounter ？

1. Too many network card interrupts , Take up too much CPU, This leads to frequent business interruptions , What do I do ？
2. Application calls write() perhaps send() Contract awarding , Why can't I send it out ?
3. The packet has been received by the network card , But why didn't the application receive it ?
4. I want to resize the buffer , But why not take effect ?
5. Is the kernel buffer full causing packet loss , How should I observe ;