Re: [LTP] [PATCH 0/0] Traffic control cgroups subsystem

[Subrata M. <su...@li...>]

On Fri, 2008-07-25 at 05:18 +0530, Subrata Modak wrote:
> Hi Ranjit,
> 
> Good to see these Traffic control patches for the Linux kernel. Let me
> take this opportunity to convey that we have:
> 
> 1) CPU & Memory controller test cases (the corresponding features are
> already in mainline kernel),
> 2) The I/O bandwidth controller test cases (corresponding
> infrastructure proposed by Andrea, but still not in any kernel tree)
> 
> in LTP (http://ltp.sourceforge.net/).
> 
> Could you kindly let me know if you have developed similar test cases
> for your Traffic control features, and, if they can be contributed to
> LTP under GPL.

Ranjit,

Would you like to tell us something on the test cases for this ?

Regards--
Subrata

> 
> Regards--
> Subrata
> 
> On Fri, Jul 25, 2008 at 5:03 AM, Ranjit Manomohan <ra...@go...>
> wrote:
>         [Take 4] incorporated additional comments from Patrick McHardy
>         
>         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 <ra...@go...>
>         
>         ---
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> 
> 
> -- 
> Regards & Thanks--
> Subrata
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