Hi all,
I just do some udp test on windows by iperf 2.0.2. The results are
strange.
1. Version of my iperf on windows:
C:\>iperf -v
iperf version 2.0.2 (03 May 2005) pthreads
2. If test with low bandwidth, it is ok.
C:\>iperf -c 192.168.0.23 -i 1 -t 5 -b 20m
WARNING: option -b implies udp testing
------------------------------------------------------------
Client connecting to 192.168.0.23, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 63.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.198 port 2529 connected with 192.168.0.23 port 5001
[ 3] 0.0- 1.0 sec 2.38 MBytes 20.0 Mbits/sec
[ 3] 1.0- 2.0 sec 2.38 MBytes 20.0 Mbits/sec
[ 3] 2.0- 3.0 sec 2.38 MBytes 20.0 Mbits/sec
[ 3] 3.0- 4.0 sec 2.38 MBytes 20.0 Mbits/sec
[ 3] 4.0- 5.0 sec 2.38 MBytes 20.0 Mbits/sec
[ 3] 0.0- 5.0 sec 11.9 MBytes 20.0 Mbits/sec
[ 3] Sent 8502 datagrams
[ 3] WARNING: did not receive ack of last datagram after 10 tries.
Here the ip 192.168.0.23 doesn't exist. I just want to try the
capacity that windows iperf can achieve. The results is ok.
3. If test with high bandwidth , it is abnormal:
C:\>iperf -c 192.168.0.23 -i 1 -t 5 -b 40m
WARNING: option -b implies udp testing
------------------------------------------------------------
Client connecting to 192.168.0.23, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 63.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.198 port 2562 connected with 192.168.0.23 port 5001
[ 3] 0.0- 1.0 sec 4.77 MBytes 40.0 Mbits/sec
[ 3] 1.0- 2.0 sec 4.77 MBytes 40.0 Mbits/sec
[ 3] 2.0- 3.0 sec 4.14 MBytes 34.7 Mbits/sec
[ 3] 3.0- 4.0 sec 2.52 MBytes 21.2 Mbits/sec
[ 3] 4.0- 5.0 sec 1.52 MBytes 12.7 Mbits/sec
[ 3] 0.0- 5.0 sec 17.7 MBytes 29.6 Mbits/sec
[ 3] Sent 12640 datagrams
[ 3] WARNING: did not receive ack of last datagram after 10 tries.
It seems that windows can't sent 40Mbits/s. But Linux can get stable 780Mbits/s.
If I do the test with one real server, the result is almost the same.
C:\>iperf -c 192.168.0.199 -i 1 -t 5 -b 40m
WARNING: option -b implies udp testing
------------------------------------------------------------
Client connecting to 192.168.0.199, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 63.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.198 port 2608 connected with 192.168.0.199 port 5001
[ 3] 0.0- 1.0 sec 4.77 MBytes 40.0 Mbits/sec
[ 3] 1.0- 2.0 sec 4.77 MBytes 40.0 Mbits/sec
[ 3] 2.0- 3.0 sec 3.91 MBytes 32.8 Mbits/sec
[ 3] 3.0- 4.0 sec 2.72 MBytes 22.8 Mbits/sec
[ 3] 4.0- 5.0 sec 1.74 MBytes 14.6 Mbits/sec
[ 3] 0.0- 5.0 sec 17.9 MBytes 29.9 Mbits/sec
[ 3] Sent 12771 datagrams
[ 3] Server Report:
[ 3] 0.0- 5.0 sec 17.8 MBytes 29.8 Mbits/sec 2.136 ms 42/12770 (0.33%)
[ 3] 0.0- 5.0 sec 1 datagrams received out-of-order
Here, 192.168.0.199 is direct connect to this windows PC. They two are all in
the same LAN. The Ethernet is 1Gbps. There is no heavy load on the two machine.
Why the windows version work like this? Anybody can help me on this?
Regards
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