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 dont 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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Content-Type: text/html; charset=us-ascii
<DIV>
<DIV>Hello ,</DIV>
<DIV> </DIV>
<DIV>I tried a simple test as follow :</DIV>
<DIV> </DIV>
<DIV>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 :</DIV>
<DIV> </DIV>
<DIV><STRONG>tc qdisc add dev eth1 root handle 1: tbf rate 0.5 mbit
burst 5kb latency 50ms</STRONG></DIV>
<DIV> </DIV>
<DIV>and generate traffic as below:</DIV>
<DIV> </DIV>
<DIV><STRONG>Iperf -c linux3 -u -b 0.1m -w
128k</STRONG></DIV>
<DIV> </DIV>
<DIV>and the result is :</DIV>
<DIV> </DIV>
<DIV><STRONG>Client connecting ...., udp ..
</STRONG></DIV>
<DIV><STRONG>Sending 1470 byte datagrams</STRONG></DIV>
<DIV><STRONG>UDP buffer size : 128 Kbyte ( WARNING: reqested 128
KByte )</STRONG></DIV>
<DIV><STRONG>Local ... port.. connected with
...</STRONG></DIV>
<DIV><STRONG>Interval
Tranfer
Bandwidth</STRONG></DIV>
<DIV><STRONG>0.0 - 10.2sec 125
KBytes 100
kbits/sec</STRONG></DIV>
<DIV><STRONG>Server Report :</STRONG></DIV>
<DIV><STRONG>0.0 - 2.0 sec
125 KBytes 516
Kbits/sec 94.576ms
</STRONG>(<EM>latency)</EM> <STRONG> 0/ 87
(0%) </STRONG><EM>(loss)</EM></DIV>
<DIV><STRONG>Sent 87 datagrams</STRONG></DIV>
<DIV> </DIV>
<DIV>I dont know :</DIV>
<DIV> </DIV>
<DIV>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 )</DIV>
<DIV> </DIV>
<DIV>Could you explain to me ?</DIV>
<DIV> </DIV>
<DIV>Thanks you very much!</DIV>
<DIV> </DIV>
<DIV>Ngo Hoang Giang .</DIV></DIV><p>
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href="http://vote.yahoo.com">vote.yahoo.com</a> - Register
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