分析了数据包调用检测函数匹配规则节点的平均次数计算函数，并用该函数对Snort系统规则树进行了优化，减少了数据包过滤匹配次数，极大提高了入侵检测效率-Analysis of packet matching rules called detection function of the average number of nodes the calculation function, and the system function of the Snort rules tree is optimiz