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POHow to priotize packets using tc and cgroups
 

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  1. POHow to priotize packets using tc and cgroups
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    <p>I am trying to prioritize the packets that are generated from a certain process group so that they'll be picked first to be transmitted from the PC. I aim to do this by using cgroups and tc, but it seems not to work. </p> <p>First I set up cgroups on ubuntu as follows,</p> <pre><code>modprobe cls_cgroup # load this module to get net_cls mkdir /sys/fs/cgroup/net_cls # mount point mount -t cgroup net_cls -onet_cls /sys/fs/cgroup/net_cls/ mkdir /sys/fs/cgroup/net_cls/foo # new cgroup echo 0x00010001 &gt; /sys/fs/cgroup/foo/net_cls.classid # echo in a class id echo 2348 &gt; /sys/fs/cgroup/net_cls/foo/tasks # echo in pid of firefox tc qdisc add dev eth0 root handle 1: pri tc qdisc add dev eth0 parent 1:1 handle 10: sfq tc qdisc add dev eth0 parent 1:2 handle 20: sfq tc qdisc add dev eth0 parent 1:3 handle 30: sfq </code></pre> <p>and after browsing in firefox and running,</p> <pre><code>tc -s qdisc ls dev eth0 </code></pre> <p>I get,</p> <pre><code>qdisc prio 1: root refcnt 2 bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1 Sent 29351 bytes 154 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 10: parent 1:1 limit 127p quantum 1514b divisor 1024 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 20: parent 1:2 limit 127p quantum 1514b divisor 1024 Sent 27873 bytes 143 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 qdisc sfq 30: parent 1:3 limit 127p quantum 1514b divisor 1024 Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0 </code></pre> <p>Instead I want the traffic to flow in handle 10, what am I doing wrong?</p>
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    1. USMadura Anushanga
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    1. COJust a wild guess. Does firefox use multiple threads? Maybe you need to put the thread ids in tasks file. (ps -eLf)
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      1. USMichael Closson
 

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