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However, in the current single-threaded Reactor mode, not only I/O operations are processed on the Reactor thread, but also non-I/O business operations are processed on the Reactor thread, which may greatly delay the response of I/O requests. Therefore, we should unload non-I/O business logic operations from Reactor threads to speed up Reactor threads' response to I/O requests.　　多年未见的兄弟重逢，行窃同样靠脚步。戴拉因为一场事故失去了父母。且遭到了法庭不公的审判，生活因此发生巨变。只能和姐姐二人搬去奶奶家生活。戴拉开始努力学习中文。因此结识了出身富贵却同样憎恨不平等的阿卡，并渐渐爱上了她。DragonSlayer.Part: The process of solving crimes,When a client accesses a server's web service, The client sends a message to the network card, The tcp/ip stack is part of the kernel, Therefore, the client information is transferred to the web service in user space through the kernel's TCP protocol, At this time, the destination destination of the client message is on the socket (IP: Port) that the web service is listening for. When a web service needs to respond to a client request, The destination destination of the response message sent by the web service is the client, At this time, The IP and port that the web service listens on becomes the origin instead, As we said, Netfilter is the real firewall, It is part of the kernel, Therefore, if we want the firewall to achieve the goal of "fire prevention", You need to set up checkpoints in the kernel. All incoming and outgoing messages have to pass through these checkpoints. After checking, those that meet the release conditions can be released, while those that meet the blocking conditions need to be blocked. As a result, input checkpoints and output checkpoints appear. These checkpoints are not called "checkpoints" but "chains" in iptables.