Iperf3 default window size

1. What is default window size for iperf3?
2. What is the default TCP window size?
3. What is the data size of iperf3?
4. What is the default TCP packet size in iPerf?

What is default window size for iperf3?

The default window size that iPerf uses varies by machine type and operating system. If it's 64 KBytes, with a modest latency of 10 ms, the maximum bandwidth you can get is 52.43 Mbits/sec. For 500 ms the maximum is 524 Kbits/sec.

What is the default TCP window size?

The TCP window size field controls the flow of data and is limited to 2 bytes, or a window size of 65,535 bytes. Since the size field can't be expanded, a scaling factor is used. TCP window scale is an option used to increase the maximum window size from 65,535 bytes to 1 Gigabyte.

What is the data size of iperf3?

For TCP tests, the default value is 128KB. In the case of UDP, iperf3 tries to dynamically determine a reasonable sending size based on the path MTU; if that cannot be determined it uses 1460 bytes as a sending size. For SCTP tests, the default size is 64KB.

What is the default TCP packet size in iPerf?

Iperf works by writing an array of len bytes a number of times. Default is 8 KB for TCP, 1470 bytes for UDP.