netdev - [PATCH 0/2] Traffic control cgroups subsystem

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Message-ID: <Pine.LNX.4.64.0809101026190.7050@ranjit.corp.google.com>
Date:	Wed, 10 Sep 2008 10:40:26 -0700 (PDT)
From:	Ranjit Manomohan <ranjitm@...gle.com>
To:	davem@...emloft.net, kaber@...sh.net, akpm@...ux-foundation.org,
	lizf@...fujitsu.com, menage@...gle.com, tgraf@...g.ch
cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 0/2] Traffic control cgroups subsystem

Incorporated fixes suggested by Li Zefan.

Please consider for net-next-2.6.

This patch provides a simple resource controller (cgroup_tc) based on the
cgroups infrastructure to manage network traffic. The cgroup_tc resource
controller can be used to schedule and shape traffic belonging to the task(s)
in a particular cgroup.

The implementation consists of two parts:

1) A resource controller (cgroup_tc) that is used to associate packets from
   a particular task belonging to a cgroup with a traffic control class id (
   tc_classid). This tc_classid is propagated to all sockets created by tasks
   in the cgroup and will be used for classifying packets at the link layer.

2) A new traffic control classifier (cls_cgroup) that can classify packets
   based on the tc_classid field in the socket to specific destination classes.

An example of the use of this resource controller would be to limit
the traffic from all tasks from a file_server cgroup to 100Mbps. We could
achieve this by doing:

# make a cgroup of file transfer processes and assign it a arbitrary unique
# classid of 0x1234 - this will be used later to direct packets.
mkdir -p /dev/cgroup
mount -t cgroup tc -otc /dev/cgroup
mkdir /dev/cgroup/file_transfer
echo 0x1234 > /dev/cgroup/file_transfer/tc.classid
echo $PID_OF_FILE_XFER_PROCESS > /dev/cgroup/file_transfer/tasks

# Now create a HTB class that rate limits traffic to 100mbits and attach
# a filter to direct all traffic from cgroup file_transfer to this new class.
tc qdisc add dev eth0 root handle 1: htb
tc class add dev eth0 parent 1: classid 1:10 htb rate 100mbit ceil 100mbit
tc filter add dev eth0 parent 1: handle 800 protocol ip prio 1 cgroup value 0x1234 classid 1:10

Signed-off-by: Ranjit Manomohan <ranjitm@...gle.com>

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