使用pktgen测试GWN7000包转发率
思博伦通信Smartbits测试设备,做为专业的发包仪器非常不错，但唯一的缺点就是太贵.还好Linux为我们提供了一个先进的发包pktgen，这个工具以内核模块的形式存在，理论上性能应该比同等运行在应用层的工具性能要好，而且还是所谓的多核支持.
1.1 测试Swich模式下的LAN口间的包转发率
测试环境:
测试步骤如下:
步骤1)，首先加载pktgen.
在Linux PC上运行modprobe pktgen 命令.
加载成功后, 会有对应的/proc/net/pktgen接口，pktgen是每一个cpu绑定一个内核线程，如果PC机有4个cpu，所以这里可以看到4个kpktgend_*文件(假设PC机是4核的)： 1 2 3 4 5 6 7 8 9 [root@localhost ~]#modprobe pktgen [root@localhost ~]# cat /proc/cpuinfo | grep processor processor : 0 processor : 1 processor : 2 processor : 3 [root@localhost ~]#ls /proc/net/pktgen/ kpktgend_0 kpktgend_1 kpktgend_2 kpktgend_3 pgctrl 假如PC机一共有3个网口，拿其中的2个网口（eth1/eth2）用于pktgen测试. 可以先使用ethtool工具查看eth1/eth2网口的速率.
如果网口速率没有协商成1000M, 也可以使用如下命令进行修改. ethtool -s eth1 autoneg off speed 1000 duplex full ethtool -s eth2 autoneg off speed 1000 duplex full
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 [root@localhost pktgen]#ifconfig eth1 eth5 Link encap:Ethernet HWaddr 00:0C:29:97:9B:B4 inet addr:192.168.1.95 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe97:9bb4/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15044140 errors:0 dropped:0 overruns:0 frame:0 TX packets:14210498 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:903846363 (861.9 MiB) TX bytes:852636332 (813.1 MiB) [root@localhost pktgen]# ifconfig eth2 eth6 Link encap:Ethernet HWaddr 00:0C:29:97:9B:BE inet addr:192.168.1.96 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe97:9bbe/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14256340 errors:0 dropped:0 overruns:0 frame:0 TX packets:14998657 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:856589260 (816.9 MiB) TX bytes:899925597 (858.2 MiB) [root@localhost pktgen]# ethtool -s eth1 autoneg off speed 1000 duplex full [root@localhost pktgen]# ethtool -s eth2 autoneg off speed 1000 duplex full [root@localhost pktgen]# ethtool eth1 Settings foreth5: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) Link detected: yes 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 [root@localhost pktgen]# ethtool eth2 Settings foreth6: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) Link detected: yes [root@localhost pktgen]# 步骤2 ) 查看两个网口的中断号，并把eth1/eth2做亲和性绑定到特定的cpu.
注意:先关闭系统的irqbalance服务
[root@localhost ~]# cat /proc/interrupts | grep eth 16: 2586 540 1351588 4172554 IO-APIC-fasteoi Ensoniq AudioPCI, eth1 19: 5117 1949714 6098060 40 IO-APIC-fasteoi eth4, eth2 #说明:16和19 表示的是eth1和eth2的中断号 [root@localhost ~]# /etc/init.d/irqbalance stop Stopping irqbalance: [ OK ] #使用上面的命令停止irqbalance服务后,下面的语句就是绑定特定的cpu了: 注意: cpu的值对应关系如下: Binary Hex CPU 0 00000001 1 CPU 1 00000010 2 CPU 2 00000100 4 CPU 3 00001000 8 1 2 3 4 5 6 7 8 9 10 11 12 例如:如果我想把 IRQ 绑定到 CPU2 上就是 00000100＝4： [root@localhost ~]# echo 4 > /proc/irq/19/smp_affinity [root@localhost ~]# echo 8 > /proc/irq/16/smp_affinity [root@localhost ~]# cat /proc/irq/19/smp_affinity 04 [root@localhost ~]# cat /proc/irq/16/smp_affinity 08
步骤3)在PC机上运行pktgen测试脚本:
脚本1:
2个网口(eth1/eth2))双向对发脚本. (即GWN7000的LAN1和LAN5之间双向对发数据测试) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 #! /bin/sh # FileName: pktgen-eth1-eth2.conf # modprobe pktgen pgset() { local result echo $1 > $PGDEV result=`cat $PGDEV | fgrep \ if [ \ cat $PGDEV | fgrep Result: fi } pg() { echo inject > $PGDEV cat $PGDEV } # Config Start Here ----------------------------------------------------------- # thread config # Each CPU has own thread. Two CPU exammple. We add eth1, eth2 respectivly.