我有一个脚本来设置端口eth0上的stream量整形。 脚本如下：
import os import subprocess def run(cmd): print cmd result = subprocess.check_output(cmd, shell=True) print result interface_name = 'eth0' bandwidth = 1 remove_rule = "sudo tc qdisc del dev {} root".format(interface_name) cmd1 = 'sudo tc qdisc add dev {} handle 1: root htb default 11'.format(interface_name) cmd2 = 'sudo tc class add dev {} parent 1: classid 1:1 htb rate {}kbit ceil {}kbit'.format(interface_name, bandwidth, bandwidth) cmd3 = 'sudo tc class add dev {} parent 1:1 classid 1:11 htb rate {}kbit ceil {}kbit'.format(interface_name, bandwidth, bandwidth) try: run(remove_rule) except: print 'Qdisc does not exist yet' run(cmd1) run(cmd2) run(cmd3) show_qdisc = 'tc -s -d qdisc show dev {}'.format(interface_name) show_class = 'tc -s -d class show dev {}'.format(interface_name) run(show_qdisc) run(show_class) 相当直接的stream量分类。 当我运行脚本时，tc show会报告下面的细节。
tc -s -d qdisc show dev eth0 qdisc htb 1: root refcnt 3 r2q 10 default 11 direct_packets_stat 6 ver 3.17 direct_qlen 1000 Sent 1154 bytes 9 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 tc -s -d class show dev eth0 class htb 1:11 parent 1:1 prio 0 quantum 1000 rate 1Kbit ceil 1Kbit linklayer ethernet burst 1600b/1 mpu 0b overhead 0b cburst 1600b/1 mpu 0b overhead 0b level 0 Sent 680 bytes 4 pkt (dropped 0, overlimits 0 requeues 0) rate 0bit 0pps backlog 0b 0p requeues 0 lended: 4 borrowed: 0 giants: 0 tokens: 115032210 ctokens: 115032210 class htb 1:1 root rate 1Kbit ceil 1Kbit linklayer ethernet burst 1600b/1 mpu 0b overhead 0b cburst 1600b/1 mpu 0b overhead 0b level 7 Sent 680 bytes 4 pkt (dropped 0, overlimits 0 requeues 0) rate 0bit 0pps backlog 0b 0p requeues 0 lended: 0 borrowed: 0 giants: 0 tokens: 115032210 ctokens: 115032210
但是，当我使用iperf3将stream量从eth0发送出去时，不会有任何限制。 当我运行tc show（手动这一次），结果是：
$sudo tc -s -d class show dev eth0 class mq :1 root Sent 901415262 bytes 100878 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 class mq :2 root Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
任何洞察力为什么1）节stream不工作，2）为什么tc显示类的结果是不一致的？