DAST: Iperf - Huge Numbr of Lost Datagrams Reported in first display interval - robert.g --at-- emssatnet.com
>Date: Thu, 20 Oct 2005 11:21:46 -0500
>To: robert.g --at-- emssatnet.com
>Subject: DAST: Iperf - Huge Numbr of Lost Datagrams Reported in first
display interval - robert.g --at-- emssatnet.com
>
>
>Contacting DAST re: Other about Iperf
>From: Gaetan Robert <robert.g --at-- emssatnet.com>
>
>Subject: Huge Numbr of Lost Datagrams Reported in first display interval
>
>Question/Comment:
>Hi:
>
>During a UDP test, we noticed a huge (unrealistic!) number of lost
datagrams reported by the Server in the first display interval, which is
far greater than the number of received datagrams. However, at the end of
the 10 minutes test, the summary correctly reports at the Client and Server
that no datagram was lost.
>
>Below are the Client and Server settings/results.
>
>What is causing this erroneous display of the display interval and is
there any way to fix this?
>
>Thank you for your help,
>
>Best Regards.
>
>C:\iperf>iperf -c 172.16.1.3 -u -t 600 -b 2000k
>------------------------------------------------------------
>Client connecting to 172.16.1.3, UDP port 5001
>Sending 1470 byte datagrams
>UDP buffer size: 251 KByte (default)
>------------------------------------------------------------
>[1952] local 192.168.30.10 port 1221 connected with 172.16.1.3 port 5001
>[ ID] Interval Transfer Bandwidth
>[1952] 0.0-600.0 sec 143 MBytes 2.00 Mbits/sec
>[1952] Server Report:
>[1952] 0.0-600.0 sec 143 MBytes 2.00 Mbits/sec 5.105 ms 0/102040 (0%)
>[1952] Sent 102040 datagrams
>
>
>C:\iperf>iperf -s -u -i 10
>------------------------------------------------------------
>Server listening on UDP port 5001
>Receiving 1470 byte datagrams
>UDP buffer size: 251 KByte (default)
>------------------------------------------------------------
>[1932] local 172.16.1.3 port 5001 connected with 192.168.30.10 port 1221
>[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
>[1932] 0.0-10.0 sec 2.38 MBytes 2.00 Mbits/sec 4.276 ms 1296389203/
1701 (7
>6e+007%)
>[1932] 10.0-20.0 sec 2.38 MBytes 2.00 Mbits/sec 4.368 ms 0/ 1701 (0%)
>[1932] 20.0-30.0 sec 2.38 MBytes 2.00 Mbits/sec 4.419 ms 0/ 1700 (0%)
>[1932] 30.0-40.0 sec 2.39 MBytes 2.00 Mbits/sec 4.079 ms 0/ 1702 (0%)
>[1932] 40.0-50.0 sec 2.38 MBytes 2.00 Mbits/sec 4.584 ms 0/ 1699 (0%)
>[1932] 50.0-60.0 sec 2.39 MBytes 2.00 Mbits/sec 4.262 ms 0/ 1702 (0%)
>...
>[1932] 590.0-600.0 sec 2.38 MBytes 2.00 Mbits/sec 4.698 ms 0/ 1699 (0%)
>[ ID] Interval Transfer Bandwidth Jitter Lost/Total
Datagrams
>[1932] 0.0-600.0 sec 143 MBytes 2.00 Mbits/sec 5.106 ms 0/102040 (0%)
>
>
--
Mitch Kutzko | mitch --at-- dast.nlanr.net | mitch --at-- ncsa.uiuc.edu | 217-333-1199
http://hobbes.ncsa.uiuc.edu/