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Commit | Line | Data |
---|---|---|
077f02f1 RR |
1 | Network classifier cgroup |
2 | ------------------------- | |
3 | ||
4 | The Network classifier cgroup provides an interface to | |
5 | tag network packets with a class identifier (classid). | |
6 | ||
7 | The Traffic Controller (tc) can be used to assign | |
8 | different priorities to packets from different cgroups. | |
9 | ||
10 | Creating a net_cls cgroups instance creates a net_cls.classid file. | |
11 | This net_cls.classid value is initialized to 0. | |
12 | ||
13 | You can write hexadecimal values to net_cls.classid; the format for these | |
14 | values is 0xAAAABBBB; AAAA is the major handle number and BBBB | |
15 | is the minor handle number. | |
16 | Reading net_cls.classid yields a decimal result. | |
17 | ||
18 | Example: | |
19 | mkdir /sys/fs/cgroup/net_cls | |
20 | mount -t cgroup -onet_cls net_cls /sys/fs/cgroup/net_cls | |
21 | mkdir /sys/fs/cgroup/net_cls/0 | |
22 | echo 0x100001 > /sys/fs/cgroup/net_cls/0/net_cls.classid | |
23 | - setting a 10:1 handle. | |
24 | ||
25 | cat /sys/fs/cgroup/net_cls/0/net_cls.classid | |
26 | 1048577 | |
27 | ||
28 | configuring tc: | |
29 | tc qdisc add dev eth0 root handle 10: htb | |
30 | ||
31 | tc class add dev eth0 parent 10: classid 10:1 htb rate 40mbit | |
32 | - creating traffic class 10:1 | |
33 | ||
34 | tc filter add dev eth0 parent 10: protocol ip prio 10 handle 1: cgroup |