loadrunner: First Buffer 如何区分network和server time

http://www.voidcn.com/article/p-qlzlufoq-sq.html

• Time to First Buffer Breakdown：First Buffer Time时间分割为Network Time和Server Time，客户端http请求发送到接收到服务器端的应答包（ACK）为Network Time，从接收到ACK到完成First Buffer接受为Server Time