tc 

 1 #!/bin/bash
 2 
 3 
 4 case "$1" in
 5   status)
 6     tc -s qdisc ls dev lo
 7     tc class show dev lo
 8     ;;
 9 
10   on)
11     if [ -z "$2" ] ; then
12       echo "Usage: $0 on [#ms latency] [optional max Mbps]"
13       exit 1
14     fi
15 
16     # cribbed from http://serverfault.com/questions/507658/limit-incoming-and-outgoing-bandwidth-and-latency-in-linux
17 
18     if [ ! -z "$3" ] ; then
19       sudo tc qdisc add dev lo handle 1: root htb default 11 
20       sudo tc class add dev lo parent 1: classid 1:1 htb rate 1000Mbps
21       sudo tc class add dev lo parent 1:1 classid 1:11 htb rate "$3"Mbit
22       sudo tc qdisc add dev lo parent 1:11 handle 10: netem delay "$2"ms limit 100000
23     else
24       sudo tc qdisc add dev lo handle 1: root netem delay "$2"ms limit 100000
25     fi
26 
27     ;;
28 
29   off)
30     sudo tc qdisc del dev lo root 
31     ;;
32 
33   *)
34     echo "Use this script to add latency or bandwidth limit to the loopback device"
35     echo
36     echo "Usage:"
37     echo "  $0 status"
38     echo "  $0 on [#ms latency] [max Mbps]"
39     echo "  $0 off"
40     exit 1
41 esac

 

posted @ 2023-07-03 18:54  shixinyi  阅读(227)  评论(0)  编辑  收藏  举报