http://blog.9minutesnooze.com/analyzing-http-traffic-tcpdump-perconas-pttcpmodel/
#获取200k个packets
tcpdump -c -w output.pcap -i any #获取6009端口
tcpdump -r output.pcap -s -i any -nnq -tttt 'tcp port 6009 and (((ip[2:2] - ((ip[0]&0xf)<<2)) #默认是制定
#--watch-server 10.10.10.10:
#因此需要根据实际情况修改
./pt-tcp-model --watch-server=10.75.xxx.: ./port6009.txt >request