Package: iperf Version: 2.0.5-3 Sometimes Iperf client reports unrealistic bandwidth results:
root@debian-linx:~# iperf -c 217.28.252.17 -fm -t 600 -i60 -u -b 500m ------------------------------------------------------------ Client connecting to 217.28.252.17, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 0.16 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2 port 43385 connected with 217.28.252.17 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-60.0 sec 422744 MBytes 59104 Mbits/sec [ 3] 60.0-120.0 sec 435030 MBytes 60822 Mbits/sec [ 3] 120.0-180.0 sec 402263 MBytes 56240 Mbits/sec [ 3] 180.0-240.0 sec 398167 MBytes 55668 Mbits/sec [ 3] 240.0-300.0 sec 422746 MBytes 59104 Mbits/sec [ 3] 300.0-360.0 sec 381786 MBytes 53378 Mbits/sec [ 3] 360.0-420.0 sec 402263 MBytes 56240 Mbits/sec [ 3] 420.0-480.0 sec 406365 MBytes 56814 Mbits/sec [ 3] 480.0-540.0 sec 439132 MBytes 61395 Mbits/sec [ 3] 0.0-600.0 sec 4108674 MBytes 57443 Mbits/sec [ 3] Sent 6119890 datagrams read failed: No route to host [ 3] WARNING: did not receive ack of last datagram after 3 tries. root@debian-linx:~# root@debian-linx:~# iperf -c iperf.scottlinux.com -fm -t 600 -i60 -u -b 500m ------------------------------------------------------------ Client connecting to iperf.scottlinux.com, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 0.16 MByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2 port 52092 connected with 173.230.156.66 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-60.0 sec 862 MBytes 120 Mbits/sec [ 3] 60.0-120.0 sec 861 MBytes 120 Mbits/sec [ 3] 120.0-180.0 sec 856 MBytes 120 Mbits/sec [ 3] 180.0-240.0 sec 874 MBytes 122 Mbits/sec [ 3] 240.0-300.0 sec 871 MBytes 122 Mbits/sec [ 3] 300.0-360.0 sec 54119 MBytes 7566 Mbits/sec [ 3] 360.0-420.0 sec 879 MBytes 123 Mbits/sec [ 3] 420.0-480.0 sec 879 MBytes 123 Mbits/sec [ 3] 480.0-540.0 sec 878 MBytes 123 Mbits/sec [ 3] 540.0-600.0 sec 880 MBytes 123 Mbits/sec [ 3] 0.0-600.0 sec 61959 MBytes 866 Mbits/sec [ 3] Sent 6213531 datagrams [ 3] Server Report: [ 3] 0.0-264.8 sec 3808 MBytes 121 Mbits/sec 0.044 ms 3496865/6213530 (56%) [ 3] 0.0-264.8 sec 570 datagrams received out-of-order root@debian-linx:~# Under which conditions such behavior can occur? I would expect egress bandwidth never to be higher than target bandwidth set with "-b" flag. I am using Debian GNU/Linux 7 as a guest-OS in VMware virtual-machine(1GigE vNIC, e1000 driver), kernel 3.2.0-4-686-pae, libc6:i386 version 2.13-38+deb7u3, libgcc1:i386 version 1:4.7.2-5 and libstdc++6:i386 version 4.7.2-5. Please let me know in case additional information is needed! thanks, Martin -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
