On Tue, Aug 5, 2008 at 4:00 AM, Subrata Modak
<subrata@linux.vnet.ibm.com> wrote:
quoted text
>
> 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 ?

Subrata,
  We have some internal test cases but not under LTP. Let me take a
look at the existing LTP infrastructure and see if these can be ported
over.

-Thanks,
Ranjit


quoted text
>
> Regards--
> Subrata
>
>>
>> Regards--
>> Subrata
>>
>> On Fri, Jul 25, 2008 at 5:03 AM, Ranjit Manomohan <ranjitm@google.com>
>> 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 <ranjitm@google.com>
>>
>>         ---
>>         --
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>>
>>
>> --
>> Regards & Thanks--
>> Subrata
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