esnet/iperf

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iperf3: A TCP, UDP, and SCTP network bandwidth measurement tool

Stars: 8.8k
Forks: 1.5k
Open beginner issues: 0
Indexed issues: 159

Dominant language: C
License: No license data
Last GitHub push: Jul 10, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Open All

159 open issues indexed

Enable '-O X' option in server mode Open

enhancement Help Wanted

esnet/iperf#355 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mismatch between sent and received data size Open

bug bug:test-data Help Wanted

esnet/iperf#382 · 5 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Allow both JSON and human-readable output at the same time Open

enhancement feat:outputs Help Wanted

esnet/iperf#456 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
DSCP bit appearing in different frame in iperf2 and iperf3-current Open

bug:tos Help Wanted

esnet/iperf#510 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
libiperf catchup Open

enhancement Help Wanted

esnet/iperf#595 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Allow to provide a user password for non interactive sessions Open

enhancement

esnet/iperf#706 · 9 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
SCTP number of streams Open

bug

esnet/iperf#722 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Enhancement Request: Support setting packet mark via socket (SO_MARK) Open

enhancement

esnet/iperf#723 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Receiver Results Empty Open

bug

esnet/iperf#724 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
enhancement: systemd socket activation, service and target files Open

esnet/iperf#742 · 3 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Enhancement: Optionally add cpu_utilization_percent to each test interval Open

enhancement

esnet/iperf#747 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 client does NOT report cpu_utilization_percent to server Open

enhancement

esnet/iperf#748 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
UDP link capacity reported as 0 in JSON output Open

bug

esnet/iperf#754 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 3.5 TCP option -n not working Open

bug bug:test-data

esnet/iperf#768 · 9 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
reserved identifier violation Open

bug portability

esnet/iperf#805 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Completion of error handling Open

enhancement

esnet/iperf#806 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Get test Data/Results API through callback Open

esnet/iperf#807 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Upstream receiver end intervals reporting wrong seconds value Open

bug

esnet/iperf#836 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Invalid JSON output for buffer information Open

bug bug:json

esnet/iperf#856 · 6 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 error :unable to read from stream socket: Resource temporarily unavailable Open

esnet/iperf#862 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 15, 2026
UDP throughput issue Open

enhancement

esnet/iperf#873 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
slow udp stream generation with message size 1400B Open

esnet/iperf#899 · 4 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3: error - failed to read /dev/urandom: Bad address Open

esnet/iperf#987 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Wait for all buffered data to be sent before closing TCP Streams Open

bug:test-data

esnet/iperf#994 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Should we provide QUIC support when it is done? Open

enhancement

esnet/iperf#1017 · 12 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Allow different control connection port number than data connection Open

esnet/iperf#1019 · 8 comments · 11 reactions · 0 assignees · Indexed Sep 15, 2026
TCP bandwidth drops to zero Open

esnet/iperf#1021 · 27 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Iperf3/Iperf2 please support SSH/TLS encryption. Open

enhancement

esnet/iperf#1035 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Enhance JSON client result to contain the "accepted_connection" data from the server? Open

esnet/iperf#1042 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Iperf3 issue observed on reverse mode over an OpenVPN connection. Open

esnet/iperf#1043 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
crazy udp output with reverse mode Open

bug bug:reverse

esnet/iperf#1044 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 Bandwidth fluctuation with mutiple clients （25G NIC） Open

esnet/iperf#1047 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 v3.9 on macOS using deprecated 'daemon'; recommended to use posix_spawn APIs instead Open

Help Wanted portability

esnet/iperf#1048 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Return info from server during test Open

enhancement

esnet/iperf#1064 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add new option to allow multiple clients Open

esnet/iperf#1066 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Incorrect and impossible upload result using TCP Open

esnet/iperf#1069 · 27 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 single-stream low bandwidth with small message sizes (1KB, 1500B, 2000B, etc.) Open

esnet/iperf#1078 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
--get-server-output option does not work when using option --udp-counters-64bit Open

esnet/iperf#1080 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3: error - unable to connect to server: Connection refused Open

esnet/iperf#1092 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Different bandwidth limits for two transfer directions Open

enhancement

esnet/iperf#1093 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Bandwidth performance tool for chisel tunnel based on socks5 Open

esnet/iperf#1095 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Reduce default UDP Package size to physically MTU - use WSA Registered IO on windows to receive UDP packages Open

esnet/iperf#1107 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
UDP packet loss calculation Open

esnet/iperf#1142 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3: error - control socket has closed unexpectedly v.3.6 Open

esnet/iperf#1149 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3: error - unable to send control message: Bad file descriptor Open

esnet/iperf#1150 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problems with TCP connection + loss Open

esnet/iperf#1152 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
iperf3 reporting 0 bytes of throughput under UDP and high latency conditions Open

esnet/iperf#1195 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add Rwnd and RTT to iperf3 output (when not using JSON) Open

esnet/iperf#1207 · 0 comments · 20 reactions · 0 assignees · Indexed Sep 15, 2026
Reverse UDP is slower than Non-reverse UDP Open

esnet/iperf#1208 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
100% CPU usage when no data sending was possible Open

esnet/iperf#1213 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

esnet/iperf

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