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JSON output (-J) emits two top-level "error" keys on server-relayed errors

Status: Open.

#2051 In esnet/iperf;

· therealevanhenry opened on Jun 24, 2026

zerocopy os check should wait for sever response when in reverse mode

Status: Open.

#2044 In esnet/iperf;

· SnowSquire opened on May 30, 2026

Separate UDP GSO and GRO controls for Linux (--gso and --gro options)

Status: Open.

#2037 In esnet/iperf;

· roaoliver opened on May 20, 2026

iperf3 server does not honour the bind command for sending data - sends from incorrect interface

Status: Open.

#2036 In esnet/iperf;

· peterm888 opened on May 20, 2026

Cannot utilize 100gbps on Mellanox ConnectX-5

Status: Open.

#2031 In esnet/iperf;

· antiuser opened on Apr 28, 2026

For udp traffic, if send is ubuntu and receive is windows, -P, --parallel will lead iperf error

Status: Open.

#2026 In esnet/iperf;

· llh8991 opened on Apr 15, 2026

Final interval report always delayed until result exchange

Status: Open.

#2019 In esnet/iperf;

· illarionov opened on Mar 28, 2026

some different between windows and linux

Status: Open.

#1998 In esnet/iperf;

· wangguowang opened on Jan 22, 2026

Handle interrupted tests (server)

Status: Open.

#1997 In esnet/iperf;

· terrancewong opened on Jan 20, 2026

The speed test failed because the address used in the ESt UDP connection was inconsistent.

Status: Open.

#1996 In esnet/iperf;

· Mozartor2 opened on Jan 13, 2026

UDP --bidir fails when Cygwin is server (works when Cygwin is client)

Status: Open.

#1992 In esnet/iperf;

· vikranthdatta opened on Dec 29, 2025

Server hangs endlessly (0.00 Mbits/sec) on sudden client disconnect – Works in 3.14, broken in 3.16+

Status: Open.

#1986 In esnet/iperf;

· Vili-B opened on Dec 17, 2025