$ iperf3 -c 10.11.11.2 -p 5201 -t 20 -J STDOUT { "start": { "connected": [{ "socket": 5, "local_host": "10.11.11.3", "local_port": 40370, "remote_host": "10.11.11.2", "remote_port": 5201 }], "version": "iperf 3.16", "system_info": "Linux ubuntu-HP-ProBook-440-G5 6.17.0-20-generic #20~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Mar 19 01:28:37 UTC 2 x86_64", "timestamp": { "time": "Fri, 08 May 2026 19:59:08 GMT", "timesecs": 1778270348 }, "connecting_to": { "host": "10.11.11.2", "port": 5201 }, "cookie": "axfi4f6f3edhllwjm3dwuimlp52uwokc4xko", "tcp_mss_default": 1448, "target_bitrate": 0, "fq_rate": 0, "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "test_start": { "protocol": "TCP", "num_streams": 1, "blksize": 131072, "omit": 0, "duration": 20, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 0 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000357, "seconds": 1.0003570318222046, "bytes": 119537664, "bits_per_second": 955960003.857868, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 734208, "rtt": 2724, "rttvar": 91, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 0, "end": 1.000357, "seconds": 1.0003570318222046, "bytes": 119537664, "bits_per_second": 955960003.857868, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.000357, "end": 2.000312, "seconds": 0.99995499849319458, "bytes": 117309440, "bits_per_second": 938517754.71312571, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 744448, "rtt": 2710, "rttvar": 102, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 1.000357, "end": 2.000312, "seconds": 0.99995499849319458, "bytes": 117309440, "bits_per_second": 938517754.71312571, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 2.000312, "end": 3.00032, "seconds": 1.0000079870224, "bytes": 117964800, "bits_per_second": 943710862.56020164, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 690688, "rtt": 2759, "rttvar": 114, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 2.000312, "end": 3.00032, "seconds": 1.0000079870224, "bytes": 117964800, "bits_per_second": 943710862.56020164, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 3.00032, "end": 4.000322, "seconds": 1.0000020265579224, "bytes": 117178368, "bits_per_second": 937425044.25385, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 738304, "rtt": 2643, "rttvar": 137, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 3.00032, "end": 4.000322, "seconds": 1.0000020265579224, "bytes": 117178368, "bits_per_second": 937425044.25385, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 4.000322, "end": 5.000317, "seconds": 0.999994993209839, "bytes": 118358016, "bits_per_second": 946868868.773736, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 734208, "rtt": 2629, "rttvar": 113, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 4.000322, "end": 5.000317, "seconds": 0.999994993209839, "bytes": 118358016, "bits_per_second": 946868868.773736, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 5.000317, "end": 6.000314, "seconds": 0.99999701976776123, "bytes": 117440512, "bits_per_second": 939526896.00834465, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 730624, "rtt": 2657, "rttvar": 81, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 5.000317, "end": 6.000314, "seconds": 0.99999701976776123, "bytes": 117440512, "bits_per_second": 939526896.00834465, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 6.000314, "end": 7.000367, "seconds": 1.00005304813385, "bytes": 117964800, "bits_per_second": 943668340.15558136, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 744960, "rtt": 2677, "rttvar": 64, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 6.000314, "end": 7.000367, "seconds": 1.00005304813385, "bytes": 117964800, "bits_per_second": 943668340.15558136, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 7.000367, "end": 8.000329, "seconds": 0.9999619722366333, "bytes": 117178368, "bits_per_second": 937462593.60567474, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 744960, "rtt": 2693, "rttvar": 77, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 7.000367, "end": 8.000329, "seconds": 0.9999619722366333, "bytes": 117178368, "bits_per_second": 937462593.60567474, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 8.000329, "end": 9.000336, "seconds": 1.0000070333480835, "bytes": 118358016, "bits_per_second": 946857468.421839, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 725504, "rtt": 2698, "rttvar": 78, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 8.000329, "end": 9.000336, "seconds": 1.0000070333480835, "bytes": 118358016, "bits_per_second": 946857468.421839, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 9.000336, "end": 10.000316, "seconds": 0.99997997283935547, "bytes": 117309440, "bits_per_second": 938494315.376418, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 730624, "rtt": 2672, "rttvar": 75, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 9.000336, "end": 10.000316, "seconds": 0.99997997283935547, "bytes": 117309440, "bits_per_second": 938494315.376418, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 10.000316, "end": 11.000319, "seconds": 1.0000029802322388, "bytes": 117440512, "bits_per_second": 939521296.00834465, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 731136, "rtt": 2699, "rttvar": 75, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 10.000316, "end": 11.000319, "seconds": 1.0000029802322388, "bytes": 117440512, "bits_per_second": 939521296.00834465, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 11.000319, "end": 12.000367, "seconds": 1.000048041343689, "bytes": 118226944, "bits_per_second": 945770115.93280971, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 732672, "rtt": 2721, "rttvar": 68, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 11.000319, "end": 12.000367, "seconds": 1.000048041343689, "bytes": 118226944, "bits_per_second": 945770115.93280971, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 12.000367, "end": 13.001061, "seconds": 1.0006940364837646, "bytes": 117178368, "bits_per_second": 936776786.73286355, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 744960, "rtt": 2690, "rttvar": 133, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 12.000367, "end": 13.001061, "seconds": 1.0006940364837646, "bytes": 117178368, "bits_per_second": 936776786.73286355, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 13.001061, "end": 14.001062, "seconds": 1.0000009536743164, "bytes": 117964800, "bits_per_second": 943717500.00085831, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 691200, "rtt": 2776, "rttvar": 74, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 13.001061, "end": 14.001062, "seconds": 1.0000009536743164, "bytes": 117964800, "bits_per_second": 943717500.00085831, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 14.001062, "end": 15.001062, "seconds": 1, "bytes": 117178368, "bits_per_second": 937426944, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 700416, "rtt": 2726, "rttvar": 99, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 14.001062, "end": 15.001062, "seconds": 1, "bytes": 117178368, "bits_per_second": 937426944, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 15.001062, "end": 16.001061, "seconds": 0.99999898672103882, "bytes": 118095872, "bits_per_second": 944767933.31347, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 691200, "rtt": 2723, "rttvar": 222, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 15.001062, "end": 16.001061, "seconds": 0.99999898672103882, "bytes": 118095872, "bits_per_second": 944767933.31347, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 16.001061, "end": 17.001066, "seconds": 1.0000050067901611, "bytes": 117964800, "bits_per_second": 943713675.023657, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 692736, "rtt": 2657, "rttvar": 189, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 16.001061, "end": 17.001066, "seconds": 1.0000050067901611, "bytes": 117964800, "bits_per_second": 943713675.023657, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 17.001066, "end": 18.001062, "seconds": 0.9999960064888, "bytes": 117309440, "bits_per_second": 938479267.827467, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 744960, "rtt": 2689, "rttvar": 116, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 17.001066, "end": 18.001062, "seconds": 0.9999960064888, "bytes": 117309440, "bits_per_second": 938479267.827467, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 18.001062, "end": 19.001064, "seconds": 1.0000020265579224, "bytes": 117440512, "bits_per_second": 939522192.00385857, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 732672, "rtt": 2670, "rttvar": 116, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 18.001062, "end": 19.001064, "seconds": 1.0000020265579224, "bytes": 117440512, "bits_per_second": 939522192.00385857, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 19.001064, "end": 20.001393, "seconds": 1.00032901763916, "bytes": 118226944, "bits_per_second": 945504464.353323, "retransmits": 0, "snd_cwnd": 448880, "snd_wnd": 745472, "rtt": 2688, "rttvar": 88, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 19.001064, "end": 20.001393, "seconds": 1.00032901763916, "bytes": 118226944, "bits_per_second": 945504464.353323, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 20.001393, "seconds": 20.001393, "bytes": 2355625984, "bits_per_second": 942184770.43073952, "retransmits": 0, "max_snd_cwnd": 448880, "max_snd_wnd": 745472, "max_rtt": 2776, "min_rtt": 2629, "mean_rtt": 2695, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 20.004132, "seconds": 20.001393, "bytes": 2353528832, "bits_per_second": 941217077.351819, "sender": true } }], "sum_sent": { "start": 0, "end": 20.001393, "seconds": 20.001393, "bytes": 2355625984, "bits_per_second": 942184770.43073952, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 20.004132, "seconds": 20.004132, "bytes": 2353528832, "bits_per_second": 941217077.351819, "sender": true }, "cpu_utilization_percent": { "host_total": 2.2087046761901616, "host_user": 0.047315464565849376, "host_system": 2.1613742193985308, "remote_total": 8.06761370930298, "remote_user": 1.015228426395939, "remote_system": 7.0523802839488257 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } } STDERR