[Click] simple question ??

[Whoijin Jung]

Hello~

I tested a link performance using the "iperf" tool.

However I received a following warning message.

[ToDevice backing off for 1 at 1279158446.103797]

What is meaning this warning??

 

The other warning message is [Queue: overflow].

My testbed consists of two Click router and four end-hosts.

 

Host1 ---|--- Click1 ----- Click2 ---|--- host2

         |                        |

Host3 ---|                        |--- host4

 

Host1 and host3 are iperf server that link bandwidth is 100 Mbps.

[host1 command: iperf -s -u -l 1400]

[host3 command: iperf -s -u -l 1400]

 

Host2 and host4 are iperf client that link bandwidth is 100 Mbps.

[host2 command: iperf -c host1 -u -b 200M -l 1400]

[host4 command: iperf -c host3 -u -b 200M -l 1400]

 

-b 200M : for link bandwidth overflow

Because my test is DRR Scheduling, each client sending the exceeded traffic
to server.

However, with above the warning message occurs and DRRSched element does not
control the traffic fairly.

I do not know how it will solve this problem.

Anybody comment to me~.plz.

Thanks in advance.

 

 

 

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Best Regards,

Whoijin Jung