Comments on: iPerf3 – Test Network Speed/Throughput in Linux

By: Xuancong

Xuancong — Tue, 09 May 2023 02:34:26 +0000

Command line error: for a bi-directional test, `iperf3` uses `--bidir` while `iperf` uses `-d`.

By: HopAlong Cassidy

HopAlong Cassidy — Sat, 18 Mar 2023 18:15:20 +0000

Your 1 link per Performance Tuning: jumps to other networking tools. "Not" the actual TCP/UDP tuning. What is in need is actual and proper TCP/UDP tuning tips on correctly setting one Linux Interface to maximize the actual Throughput performance pt-pt regarding 100meg 1gig 2.5gig and 10g networking achievement. With many of the /etc/sysctl.conf set empty with respect to the vehicle for setting outside Kernel /proc/TCP feature. It is a hard search to find the correct documentation for one to set Test and find the actual settings one can load into /etc/sysctl.conf to get the maximum transfer speeds per file transfer. Be helpful to some simple examples using some of the tools "IPerf3" and such to help those help themselves obtain these results on their own home and necessary networks. Something of such Document would be GOLD for all Seekers to such accurate information, and not the jump here and there to nothing. We're advanced enough with all this tech. Out of box experience provides "Nothing" Nor does any Distro provide information to Tweek Tune their own OS for these Parameter features to enrich that out-of-box experience. "Just a penny toss" Food for thought...

By: John

John — Tue, 22 Jun 2021 18:56:22 +0000

I had never encountered iperf3 before today. But we have to log a cluster soak test, and iperf works as either a server or a client against a server. So I set up a server on one of the four clients and then run iperf clients out of cronjobs on all four clients. Only the cronjobs fire at random or silently fail. I don’t work out why until I’ve been fiddling for 3 hours. Hours I should have been doing something else.

tldr; iperf is serial only not parallel, if you stagger the cronjobs, they all work, if they fire at the same time, only one of them will, at random. Caveat Emptor.

By: Ravi Saive

Ravi Saive — Mon, 23 Dec 2019 05:55:39 +0000

In reply to Daniele Testa.

@Daniele,

Corrected the commands in the article. Sorry for delay…

By: Daniele Testa

Daniele Testa — Sun, 22 Dec 2019 16:50:13 +0000

In reply to Aaron Kili.

Still, you did not correct the article? Why?