$ iperf3 -c 10.11.11.2 -p 5201 -t 20 -J STDOUT { "start": { "connected": [{ "socket": 5, "local_host": "10.11.11.3", "local_port": 58080, "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 20:14:09 GMT", "timesecs": 1778271249 }, "connecting_to": { "host": "10.11.11.2", "port": 5201 }, "cookie": "gfa4wzua3dncomzmumyzdbn3k6ycoebqot3l", "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": 1.00106, "seconds": 1.0010600090026855, "bytes": 119799808, "bits_per_second": 957383628.73451769, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 528384, "rtt": 2111, "rttvar": 111, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 0, "end": 1.00106, "seconds": 1.0010600090026855, "bytes": 119799808, "bits_per_second": 957383628.73451769, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.00106, "end": 2.001052, "seconds": 0.9999920129776, "bytes": 117440512, "bits_per_second": 939531600.059935, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 536064, "rtt": 2168, "rttvar": 117, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 1.00106, "end": 2.001052, "seconds": 0.9999920129776, "bytes": 117440512, "bits_per_second": 939531600.059935, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 2.001052, "end": 3.00106, "seconds": 1.0000079870224, "bytes": 118095872, "bits_per_second": 944759430.18526864, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 556544, "rtt": 2132, "rttvar": 100, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 2.001052, "end": 3.00106, "seconds": 1.0000079870224, "bytes": 118095872, "bits_per_second": 944759430.18526864, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 3.00106, "end": 4.001052, "seconds": 0.9999920129776, "bytes": 117440512, "bits_per_second": 939531600.059935, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 592384, "rtt": 2152, "rttvar": 96, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 3.00106, "end": 4.001052, "seconds": 0.9999920129776, "bytes": 117440512, "bits_per_second": 939531600.059935, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 4.001052, "end": 5.001063, "seconds": 1.0000109672546387, "bytes": 117309440, "bits_per_second": 938465227.61287928, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 571904, "rtt": 2130, "rttvar": 73, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 4.001052, "end": 5.001063, "seconds": 1.0000109672546387, "bytes": 117309440, "bits_per_second": 938465227.61287928, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 5.001063, "end": 6.001051, "seconds": 0.9999880194664, "bytes": 118226944, "bits_per_second": 945826883.51075757, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 577024, "rtt": 2137, "rttvar": 64, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 5.001063, "end": 6.001051, "seconds": 0.9999880194664, "bytes": 118226944, "bits_per_second": 945826883.51075757, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 6.001051, "end": 7.001056, "seconds": 1.0000050067901611, "bytes": 117309440, "bits_per_second": 938470821.2735256, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 587264, "rtt": 2163, "rttvar": 68, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 6.001051, "end": 7.001056, "seconds": 1.0000050067901611, "bytes": 117309440, "bits_per_second": 938470821.2735256, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 7.001056, "end": 8.001059, "seconds": 1.0000029802322388, "bytes": 117440512, "bits_per_second": 939521296.00834465, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 539648, "rtt": 2159, "rttvar": 92, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 7.001056, "end": 8.001059, "seconds": 1.0000029802322388, "bytes": 117440512, "bits_per_second": 939521296.00834465, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 8.001059, "end": 9.001061, "seconds": 1.0000020265579224, "bytes": 117309440, "bits_per_second": 938473618.12885427, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 592384, "rtt": 2079, "rttvar": 130, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 8.001059, "end": 9.001061, "seconds": 1.0000020265579224, "bytes": 117309440, "bits_per_second": 938473618.12885427, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 9.001061, "end": 10.001051, "seconds": 0.99998998641967773, "bytes": 117440512, "bits_per_second": 939533504.09420872, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2145, "rttvar": 110, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 9.001061, "end": 10.001051, "seconds": 0.99998998641967773, "bytes": 117440512, "bits_per_second": 939533504.09420872, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 10.001051, "end": 11.001051, "seconds": 1, "bytes": 118095872, "bits_per_second": 944766976, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 582144, "rtt": 2141, "rttvar": 88, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 10.001051, "end": 11.001051, "seconds": 1, "bytes": 118095872, "bits_per_second": 944766976, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 11.001051, "end": 12.001061, "seconds": 1.0000100135803223, "bytes": 117440512, "bits_per_second": 939514688.09420681, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2159, "rttvar": 86, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 11.001051, "end": 12.001061, "seconds": 1.0000100135803223, "bytes": 117440512, "bits_per_second": 939514688.09420681, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 12.001061, "end": 13.001061, "seconds": 1, "bytes": 117309440, "bits_per_second": 938475520, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 597504, "rtt": 2144, "rttvar": 72, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 12.001061, "end": 13.001061, "seconds": 1, "bytes": 117309440, "bits_per_second": 938475520, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 13.001061, "end": 14.001064, "seconds": 1.0000029802322388, "bytes": 118226944, "bits_per_second": 945812733.25840056, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 605184, "rtt": 2153, "rttvar": 70, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 13.001061, "end": 14.001064, "seconds": 1.0000029802322388, "bytes": 118226944, "bits_per_second": 945812733.25840056, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 14.001064, "end": 15.001061, "seconds": 0.99999701976776123, "bytes": 117309440, "bits_per_second": 938478316.88333535, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 560128, "rtt": 2168, "rttvar": 106, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 14.001064, "end": 15.001061, "seconds": 0.99999701976776123, "bytes": 117309440, "bits_per_second": 938478316.88333535, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 15.001061, "end": 16.001049, "seconds": 0.9999880194664, "bytes": 118226944, "bits_per_second": 945826883.51075757, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2075, "rttvar": 124, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 15.001061, "end": 16.001049, "seconds": 0.9999880194664, "bytes": 118226944, "bits_per_second": 945826883.51075757, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 16.001049, "end": 17.001065, "seconds": 1.0000159740448, "bytes": 117309440, "bits_per_second": 938460528.989467, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2115, "rttvar": 124, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 16.001049, "end": 17.001065, "seconds": 1.0000159740448, "bytes": 117309440, "bits_per_second": 938460528.989467, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 17.001065, "end": 18.001063, "seconds": 0.99999797344207764, "bytes": 117440512, "bits_per_second": 939526000.00385857, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2142, "rttvar": 95, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 17.001065, "end": 18.001063, "seconds": 0.99999797344207764, "bytes": 117440512, "bits_per_second": 939526000.00385857, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 18.001063, "end": 19.001066, "seconds": 1.0000029802322388, "bytes": 118095872, "bits_per_second": 944764160.383391, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 587264, "rtt": 2155, "rttvar": 80, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 18.001063, "end": 19.001066, "seconds": 1.0000029802322388, "bytes": 118095872, "bits_per_second": 944764160.383391, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 19.001066, "end": 20.00142, "seconds": 1.0003540515899658, "bytes": 117440512, "bits_per_second": 939191573.7300384, "retransmits": 0, "snd_cwnd": 380824, "snd_wnd": 614400, "rtt": 2171, "rttvar": 93, "pmtu": 1500, "omitted": false, "sender": true }], "sum": { "start": 19.001066, "end": 20.00142, "seconds": 1.0003540515899658, "bytes": 117440512, "bits_per_second": 939191573.7300384, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 20.00142, "seconds": 20.00142, "bytes": 2355494912, "bits_per_second": 942131073.493782, "retransmits": 0, "max_snd_cwnd": 380824, "max_snd_wnd": 614400, "max_rtt": 2171, "min_rtt": 2075, "mean_rtt": 2139, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 20.003475, "seconds": 20.00142, "bytes": 2353922048, "bits_per_second": 941405250.0378058, "sender": true } }], "sum_sent": { "start": 0, "end": 20.00142, "seconds": 20.00142, "bytes": 2355494912, "bits_per_second": 942131073.493782, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 20.003475, "seconds": 20.003475, "bytes": 2353922048, "bits_per_second": 941405250.0378058, "sender": true }, "cpu_utilization_percent": { "host_total": 2.18146376572551, "host_user": 0.030448886156552855, "host_system": 2.1510048832176256, "remote_total": 8.5960102684025159, "remote_user": 0.934831357770822, "remote_system": 7.6611789106316941 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } } STDERR