Hi Randy,
iperf is running in UDP-mode, so it tries to get your 5000K. (your 5000K means
nearly 5MByte) I don't know which WirelessLAN you are running, but if you are
have an WIrelessLAN IEEE 802.11a or IEEE802.11g you won't never get 5MByte per
second... but round about 3 Mbyte per second is an realistic number.
(sorry for my bad english)
Greeting
Frank Lindner
Von: Randy Buck [mailto:sutekistud...@gmail.com]
Gesendet: Dienstag, 23. März 2010 21:46
An: iperf-users@lists.sourceforge.net
Betreff: [Iperf-users] Reported Bandwidth
Hi all,
I am using Iperf to find the optimal sending rate of my wireless mesh network.
I am running into an issue when I run the following command:
iperf -u -fk -c 5.0.0.1 -b 5000K -p 4000 -t 10
I get the following report (or something very similar). I've bolded parts in
question:
------------------------------
------------------------------
Client connecting to 5.0.0.1, UDP port 4000
Sending 1470 byte datagrams
UDP buffer size: 109 KByte (default)
------------------------------------------------------------
[ 3] local 5.0.0.24 port 58708 connected with 5.0.0.1 port 4000
[ 3] 0.0-10.2 sec 3623 KBytes 2916 Kbits/sec
[ 3] Sent 2524 datagrams
[ 3] Server Report:
[ 3] 0.0-10.4 sec 2703 KBytes 2128 Kbits/sec 26.951 ms 640/ 2523 (25%)
[ 3] 0.0-10.4 sec 1 datagrams received out-of-order
Why is it that when I start the client and specify -b 5000K that I am sending
at a rate much less (3623 KBytes)? Shouldn't Iperf send out UDP packets as
fast as it can? I can understand that the acutal bandwidth is much less (2703
KBytes) considering I lost 25% of the packets. Please explain to me why Iperf
is not trying to send out at 5000 KBytes. How is the number 3263 KBytes
calculated?
Thanks,
Randy Buck
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