本文分享自天翼云开发者社区《T-rex压测工具使用》，作者：f****n

trex使用 一、软件版本 TRex版本：v3.00 二、无状态模式（单设备发包） 1.工作目录

cd /home/root/trex/scripts/

2.dpdk网卡使用

modprobe uio
insmod /home/root/pktgen-3.7.2/igb_uio.ko
/home/root/dpdk-devbind.py -b igb_uio 3b:00.1 &&\
/home/root/dpdk-devbind.py -b igb_uio af:00.1

3.stl服务启动

//-i 交互模式， --stl 无状态模式 --no-scapy-server 禁用 Scapy 服务器，Scapy 是一个 Python 库，用于网络数据包的创建和解析   -c 16 运行16个lcore
./t-rex-64 -i  --stl --no-scapy-server -c 16

4.控制台启动

//在新窗口
./trex-console -s 127.0.0.1 --force

5.控制台执行脚本

trex> start -f stl/split_var_to_cores.py -m 700000
// -m 700000 为重复次数，执行这个脚本得话实际看是pps数量，

6.脚本介绍 stl/split_var_to_cores.py 作用：测试other协议包、udp协议包等自定义类型包，可以指定payload长度

from trex_stl_lib.api import *
import argparse


class STLS1(object):

    def create_stream (self, direction):
        payload_len = 0
        #GRE
        #base_pkt =  Ether(dst='00:00:aa:aa:aa:aa',src='00:00:bb:bb:bb:bb')/IP()/GRE(key=12345)/IP()/UDP()/('!'*payload_len)
        #TCP SYN
        base_pkt =  Ether(dst='00:00:aa:aa:aa:aa',src='00:00:bb:bb:bb:bb')/IP()/TCP(flags="S")/('!'*payload_len)
        #UDP
        #base_pkt =  (Ether(dst='00:00:aa:aa:aa:aa',src='00:00:bb:bb:bb:bb')/IP()/UDP()/('*' * payload_len))
        #VLAN
       #base_pkt =  (Ether(dst='00:00:aa:aa:aa:aa',src='00:00:bb:bb:bb:bb')/Dot1Q(vlan=189)/IP()/UDP()/('*' * payload_len))

        ip_range = {'src': {'start': "10.0.0.1", 'end': "10.255.255.254"},
                    'dst': {'start': "8.0.0.1",  'end': "8.0.0.5"}}

        if (direction == 0):
            src = ip_range['src']
            dst = ip_range['dst']
        else:
            src = ip_range['dst']
            dst = ip_range['src']


        vm = STLVM()

        vm.var(name="src", min_value=src['start'], max_value=src['end'], size=4, op='inc')
        vm.var(name="dst", min_value=dst['start'], max_value=dst['end'], size=4, op='inc')
        vm.var(name="src", min_value=1024, max_value=65535, size=2, op='inc')       # 端口号按递增赋值
        vm.var(name="dst", min_value=5011, max_value=5011, size=2, op='inc')
     #vm.repeatable_random_var(fv_name="src_port", size=2, min_value = 1024, max_value = 65535, limit=3, seed=0)     # 随机值，seed要为可变值才能实现随机，如使用时间戳
     #vm.repeatable_random_var(fv_name="dst_port", size=2, min_value = 1024, max_value = 65535, limit=3, seed=0)
        vm.write(fv_name="src", pkt_offset='IP.src')
        vm.write(fv_name="dst", pkt_offset='IP.dst')
        #vm.write(fv_name="src_port", pkt_offset="UDP.sport")       # 根据TCP/UDP选择切换
        #vm.write(fv_name="dst_port", pkt_offset="UDP.dport")
        vm.write(fv_name="src_port", pkt_offset="TCP.sport")
        vm.write(fv_name="dst_port", pkt_offset="TCP.dport")
        vm.fix_chksum(offset='IP')
        return STLStream(packet = STLPktBuilder(pkt = base_pkt, vm = vm),
                         mode = STLTXCont())

    def get_streams (self, direction, tunables, **kwargs):
        parser = argparse.ArgumentParser(description='Argparser for {}'.format(os.path.basename(__file__)),
                                         formatter_class=argparse.ArgumentDefaultsHelpFormatter)

        args = parser.parse_args(tunables)
        # create 1 stream
        return [ self.create_stream(direction) ]


# dynamic load - used for trex console or simulator
def register():
    return STLS1()