Server JSON Output Does Not Report Client's Results #1908
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Thanks for the PR! Admittedly we want to be a little careful with the order of operations, just something we would need to test for this (and any other similar) code change. |
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@bmah888, I agree, and after further testing, these changes will need more thought from my end. I've moved this PR into a draft state and will add some updates to the template with more meaningful findings and a description of the new changes. |
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PR back in the |
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PLEASE NOTE the following text from the iperf3 license. Submitting a
pull request to the iperf3 repository constitutes "[making]
Enhancements available...publicly":
The complete iperf3 license is available in the
LICENSEfile in thetop directory of the iperf3 source tree.
Version of iperf3 (or development branch, such as
masteror3.1-STABLE) to which this pull request applies:masterIssues fixed (if any): iperf/#1410
Brief description of code changes (suitable for use as a commit message):
On the
iperfserver, no results are displayed from the client's side, even though this information is sent to the server. It appears that the reporter callback was called prior to setting the test state toDISPLAY_RESULTS. Moving the call to the reporter callback function to after that state is set seems to fix the issue, as I can now see the client's results displayed in the server's JSON output.Server JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 54714 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 17:47:32 GMT", "timesecs": 1752515252, "timemillisecs": 1752515252430 }, "accepted_connection": { "host": "127.0.0.1", "port": 54708 }, "cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 1, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.001054, "seconds": 1.001054048538208, "bytes": 62914560, "bits_per_second": 502786518.6050337, "omitted": true, "sender": false }], "sum": { "start": 0, "end": 1.001054, "seconds": 1.001054048538208, "bytes": 62914560, "bits_per_second": 502786518.6050337, "omitted": true, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.3e-05, "end": 1.000991, "seconds": 1.0010039806365967, "bytes": 62521344, "bits_per_second": 499669093.90501356, "omitted": false, "sender": false }], "sum": { "start": 1.3e-05, "end": 1.000991, "seconds": 1.0010039806365967, "bytes": 62521344, "bits_per_second": 499669093.90501356, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.000991, "end": 2.001042, "seconds": 1.0000510215759277, "bytes": 62390272, "bits_per_second": 499096711.29924917, "omitted": false, "sender": false }], "sum": { "start": 1.000991, "end": 2.001042, "seconds": 1.0000510215759277, "bytes": 62390272, "bits_per_second": 499096711.29924917, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 2.001042, "end": 2.002375, "seconds": 0.0013330000219866633, "bytes": 131072, "bits_per_second": 786628644.189543, "omitted": false, "sender": false }], "sum": { "start": 2.001042, "end": 2.002375, "seconds": 0.0013330000219866633, "bytes": 131072, "bits_per_second": 786628644.189543, "omitted": false, "sender": false } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 5, "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": false } }], "sum_sent": { "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "sender": false }, "sum_received": { "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": false }, "cpu_utilization_percent": { "host_total": 2.0814591122934472, "host_user": 0.16557515140820453, "host_system": 1.9158839608852427, "remote_total": 1.5036114967449765, "remote_user": 0.023864735875288281, "remote_system": 1.4797800450201419 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Client JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 54714, "remote_host": "127.0.0.1", "remote_port": 5202 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "timestamp": { "time": "Mon, 14 Jul 2025 17:47:32 GMT", "timesecs": 1752515252, "timemillisecs": 1752515252430 }, "connecting_to": { "host": "127.0.0.1", "port": 5202 }, "cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx", "tcp_mss_default": 32768, "target_bitrate": 0, "fq_rate": 500000000, "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "test_start": { "protocol": "TCP", "num_streams": 1, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000937, "seconds": 1.0009369850158691, "bytes": 65404928, "bits_per_second": 522749615.44327831, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1083, "rttvar": 9, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }], "sum": { "start": 0, "end": 1.000937, "seconds": 1.0009369850158691, "bytes": 65404928, "bits_per_second": 522749615.44327831, "retransmits": 0, "omitted": true, "sender": true } }, { "streams": [{ "socket": 5, "start": 8.6e-05, "end": 1.00049, "seconds": 1.0005760192871094, "bytes": 62259200, "bits_per_second": 497786865.16479534, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1083, "rttvar": 7, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 8.6e-05, "end": 1.00049, "seconds": 1.0005760192871094, "bytes": 62259200, "bits_per_second": 497786865.16479534, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.00049, "end": 2.002327, "seconds": 1.0018370151519775, "bytes": 62390272, "bits_per_second": 498206962.26150489, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1091, "rttvar": 20, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 1.00049, "end": 2.002327, "seconds": 1.0018370151519775, "bytes": 62390272, "bits_per_second": 498206962.26150489, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 6127872, "max_rtt": 1091, "min_rtt": 1083, "mean_rtt": 1085, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 2.002375, "seconds": 2.002327, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": true } }], "sum_sent": { "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": true }, "cpu_utilization_percent": { "host_total": 1.5036114967449765, "host_user": 0.023864735875288281, "host_system": 1.4797800450201419, "remote_total": 2.0814591122934472, "remote_user": 0.16557515140820453, "remote_system": 1.9158839608852427 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Update 07-14-2025
My first round of changes were breaking. Moving the call to the reporter callback function would break
--get-server-outputby leaving theendsection empty. The root of this issue is that the server calls the callback BEFORE receiving results from the client as part ofiperf_exchange_results. The expected behavior for the server is as follows:EXCHANGE_RESULTS.The latest changes reflect this flow, and a change to the report callback was made to also trigger for the
EXCHANGE_RESULTStest state. I have not thoroughly tested how that change impacts other areas of the code, so I would definitely appreciate any thoughts for concern there from the maintainers.Server JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51526 }, { "socket": 9, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51536 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "accepted_connection": { "host": "127.0.0.1", "port": 51516 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 62783488, "bits_per_second": 502159433.93031961, "omitted": true, "sender": false }, { "socket": 9, "start": 0, "end": 1.000226, "seconds": 1.0002260208129883, "bytes": 62783488, "bits_per_second": 502154406.65276271, "omitted": true, "sender": false }], "sum": { "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 125566976, "bits_per_second": 1004318867.8606392, "omitted": true, "sender": false } }, { "streams": [{ "socket": 5, "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 62521344, "bits_per_second": 499660584.76980478, "omitted": false, "sender": false }, { "socket": 9, "start": 4.1e-05, "end": 1.000977, "seconds": 1.0010180473327637, "bytes": 62521344, "bits_per_second": 499662072.35995078, "omitted": false, "sender": false }], "sum": { "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 125042688, "bits_per_second": 999321169.53960955, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.00097, "end": 2.000962, "seconds": 0.9999920129776, "bytes": 62521344, "bits_per_second": 500174746.90690744, "omitted": false, "sender": false }, { "socket": 9, "start": 1.000977, "end": 2.000968, "seconds": 0.999990999698639, "bytes": 62521344, "bits_per_second": 500175253.728017, "omitted": false, "sender": false }], "sum": { "start": 1.00097, "end": 2.000962, "seconds": 0.9999920129776, "bytes": 125042688, "bits_per_second": 1000349493.8138149, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 2.000962, "end": 2.00393, "seconds": 0.0029680000152438879, "bytes": 131072, "bits_per_second": 353293798.724538, "omitted": false, "sender": false }, { "socket": 9, "start": 2.000968, "end": 2.003932, "seconds": 0.0029639999847859144, "bytes": 131072, "bits_per_second": 353770582.1127854, "omitted": false, "sender": false }], "sum": { "start": 2.000962, "end": 2.00393, "seconds": 0.0029680000152438879, "bytes": 262144, "bits_per_second": 706587597.449076, "omitted": false, "sender": false } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 5, "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": false } }, { "sender": { "socket": 9, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 9, "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": false } }], "sum_sent": { "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 249298944, "bits_per_second": 995604302.522418, "retransmits": 0, "sender": false }, "sum_received": { "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 250347520, "bits_per_second": 999426207.502258, "sender": false }, "cpu_utilization_percent": { "host_total": 4.3199350250562958, "host_user": 0.279305713434535, "host_system": 4.04059602527765, "remote_total": 3.0420990823002212, "remote_user": 1.4897442849610014, "remote_system": 1.5523547973392195 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Client JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 51526, "remote_host": "127.0.0.1", "remote_port": 5202 }, { "socket": 8, "local_host": "127.0.0.1", "local_port": 51536, "remote_host": "127.0.0.1", "remote_port": 5202 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "connecting_to": { "host": "127.0.0.1", "port": 5202 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 32768, "target_bitrate": 0, "fq_rate": 500000000, "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000852, "seconds": 1.0008519887924194, "bytes": 65404928, "bits_per_second": 522794009.36327845, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1078, "rttvar": 10, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }, { "socket": 8, "start": 0, "end": 1.000856, "seconds": 1.0008560419082642, "bytes": 65404928, "bits_per_second": 522791892.23094958, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1084, "rttvar": 6, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }], "sum": { "start": 0, "end": 1.000852, "seconds": 1.0008519887924194, "bytes": 130809856, "bits_per_second": 1045588018.7265569, "retransmits": 0, "omitted": true, "sender": true } }, { "streams": [{ "socket": 5, "start": 5.2e-05, "end": 1.000946, "seconds": 1.0009980201721191, "bytes": 62259200, "bits_per_second": 497577008.10872483, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1062, "rttvar": 17, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }, { "socket": 8, "start": 4.8e-05, "end": 1.000952, "seconds": 1.0010000467300415, "bytes": 62259200, "bits_per_second": 497576000.74750531, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1081, "rttvar": 14, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 5.2e-05, "end": 1.000946, "seconds": 1.0009980201721191, "bytes": 124518400, "bits_per_second": 995154016.21744967, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.000946, "end": 2.003197, "seconds": 1.0022510290145874, "bytes": 62390272, "bits_per_second": 498001160.93743163, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1084, "rttvar": 14, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }, { "socket": 8, "start": 1.000952, "end": 2.0032, "seconds": 1.0022480487823486, "bytes": 62390272, "bits_per_second": 498002641.767568, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1081, "rttvar": 5, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 1.000946, "end": 2.003197, "seconds": 1.0022510290145874, "bytes": 124780544, "bits_per_second": 996002321.87486327, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 3858944, "max_rtt": 1084, "min_rtt": 1062, "mean_rtt": 1074, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 2.00393, "seconds": 2.003197, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": true } }, { "sender": { "socket": 8, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 6127872, "max_rtt": 1084, "min_rtt": 1081, "mean_rtt": 1082, "sender": true }, "receiver": { "socket": 8, "start": 0, "end": 2.00393, "seconds": 2.003197, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": true } }], "sum_sent": { "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 249298944, "bits_per_second": 995604302.522418, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 250347520, "bits_per_second": 999426207.502258, "sender": true }, "cpu_utilization_percent": { "host_total": 3.0420990823002212, "host_user": 1.4897442849610014, "host_system": 1.5523547973392195, "remote_total": 4.3199350250562958, "remote_user": 0.279305713434535, "remote_system": 4.04059602527765 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" }, "server_output_json": { "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51526 }, { "socket": 9, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51536 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "accepted_connection": { "host": "127.0.0.1", "port": 51516 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 62783488, "bits_per_second": 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