Hello ,
I tried a simple test as follow :
I used vmware software to set up 3 virtual linux computers . The middle computer act as a router (rip protocol ) using zebra software . I used iperf-1.7.0 to generate traffic from linux computer 1 to linux computer 3 . At router ( egress side ) I setup a simple qdisc as follow :
tc qdisc add dev eth1 root handle 1: tbf rate 0.5 mbit burst 5kb latency 50ms
and generate traffic as below:
Iperf -c linux3 -u -b 0.1m -w 128k
and the result is :
Client connecting ...., udp ..
Sending 1470 byte datagrams
UDP buffer size : 128 Kbyte ( WARNING: reqested 128 KByte )
Local ... port.. connected with ...
Interval Tranfer Bandwidth
0.0 - 10.2sec 125 KBytes 100 kbits/sec
Server Report :
0.0 - 2.0 sec 125 KBytes 516 Kbits/sec 94.576ms (latency) 0/ 87 (0%) (loss)
Sent 87 datagrams
I don?t know :
Why interval time at client is : 0.0 ? 10.2 sec while at server is only 0.0 ? 2.0 sec ( bandwidth of server side much biger than client side and if I generate traffic at 0.5 mbit the loss very high although tbf qdisc has rate parameter is 0.5 mbit )
Could you explain to me ?
Thanks you very much!
Ngo Hoang Giang .
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