$ iperf3 -c 10.11.11.2 -p 5202 -t 20 -u -b 900M -R -J

STDOUT
{
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				"local_host":	"10.11.11.3",
				"local_port":	52118,
				"remote_host":	"10.11.11.2",
				"remote_port":	5202
			}],
		"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 20:15:39 GMT",
			"timesecs":	1778271339
		},
		"connecting_to":	{
			"host":	"10.11.11.2",
			"port":	5202
		},
		"cookie":	"x46uh4d7vneq7xmkgilqx3hem7y5lylvm5f3",
		"target_bitrate":	900000000,
		"fq_rate":	0,
		"sock_bufsize":	0,
		"sndbuf_actual":	212992,
		"rcvbuf_actual":	212992,
		"test_start":	{
			"protocol":	"UDP",
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			"omit":	0,
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			"bits_per_second":	899961104.896446,
			"jitter_ms":	0,
			"lost_packets":	0,
			"packets":	1553884,
			"lost_percent":	0,
			"sender":	true
		},
		"sum_received":	{
			"start":	0,
			"end":	20.00102,
			"seconds":	20.00102,
			"bytes":	2249953080,
			"bits_per_second":	899935335.2979,
			"jitter_ms":	0.010410725838564765,
			"lost_packets":	45,
			"packets":	1553880,
			"lost_percent":	0.002895969068476154,
			"sender":	false
		},
		"cpu_utilization_percent":	{
			"host_total":	33.898228996206555,
			"host_user":	10.648083946285688,
			"host_system":	23.250135051649572,
			"remote_total":	100.465033074585,
			"remote_user":	100.46501807545343,
			"remote_system":	0
		}
	}
}

STDERR