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Questions tagged [iperf]

Iperf is a network testing tool for performance and tuning that can create TCP and UDP data streams and measure the throughput of a network that is carrying them.

Iperf is a network testing tool for performance and tuning that can create TCP and UDP data streams and measure the throughput of a network that is carrying them.

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Parsing a non-regular command output

I have the following output of iperf version 2 running on LEDE OS. I am trying to parse the output to get the number before the Mbits/sec which is the average throughput of the IPERF session. However, it seems the separation between each column does…
user3849502
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Do I need use the same version of iperf3 in client and server?

I was testing our equipment TCP performance using iperf3, WiFi, powerline and ethernet. Do I need use the same version in both client and server so that I won't see weird issue or performance drop? Current I'm using server: iperf 3.1.3 client: iperf…
Jeffrey Haibo Wang
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Bind 2 network interfaces

I have a PC1 connected to a PC2 through Ethernet. The PC2 has also a WiFi interface and is connected to a WiFi network. A PC3 is also connected to the same WiFi network. So, it looks like this : PC1 <-----eth-----> PC2 <----wlan----> PC3 The…
Stochelo
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how to make windows act like iperf -w

I have 2 clients with a long distance 10 Gbit fibre connection between them. When i run iperf3 -c x.x.x.x -w 3m on the client, i manage to get close to the full 10 Gbit throughput. When i on the other hand just use iper3 -c x.x.x.x (so not…
Yves Van Wert
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64 bytes PPS throughput using iperf3

I tested PPS throughput with and without 64 bytes using PC to PC with ubuntu 14.04. Using the command as follow server - iperf3 -s client with 64 bytes iperf3 -u -c -b 1000M -t -2 -l 64 **-P 6** (OR) iperf3 -u -c -b 1000M -t…
Phyuthe
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How to set maxumim UDP buffer size in windows 7

Running iperf tool client/server between windows7 and linux. In Linux UDP buffer size set to maximum using cmd "sysctl -w net.core.rmem_max=8388608"(rmem/wmem) and trying to push 1Gb of data successfully. How to increase or set to max UDP buffer…
Blue
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Iperf3 C# Automation Issue

I am trying to automate iperf3 using c#. The problem is that for some reason the iperf3 output is redirected once the iperf test is done and does not redirect it in real time. public void RunIperf() { { sortOutput = new…
DBB
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What does the -P flag do for iperf?

What exactly does it actually do? If I do -P 100 on the client side, Does it open 100 ports and make 100 connections to a given server in parallel? Is it what's normally used to simulate a server maintaining "X (simultaneous) connections in…
Jobs
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QUIC traffic generation

I wanted to know if anyone in this community know/found a way to simulate QUIC traffic profile. For analyzing/simulating youtube over WLAN (WiFi), i wanted to know if there is a convenient package like iperf out there. Thanks Bharat C P
Bharat C Penumutchu
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UDP on iperf Windows 7 shows only 2.5 Mbps

I tried to run an iperf test between two windows 7 laptops with one hosting a ad-hoc network. Specifically I wanted to see whether I could see a visible difference in throughput between the built in PCI card and a USB wifi adapter. Unfortunately…
Vikram Raghu
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Killing a C# process gracefully not working

I have an application that spawns multiples threads, one of which runs an iPerf executable which is used to monitor network reliability. This process will run indefinitely, until the user attempts to close the window. This is where the issue comes…
MZimmerman6
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iperf UDP over IPv6

I'm doing some UDP bandwidth tests using iperf (https://iperf.fr/) over IPv6. I have very bad results when using a Linux UDP client with the following command line: iperf -u -V -c fe80::5910:d4ff:fe31:5b10%usb0 -b 100m Investigating the issue with…
Salvatore
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iperf 2 hangs with multiple udp streams

When I run iperf UDP test with multiple threads, it simply hangs. It never returns. But the same test always successfully completes with single stream. Here is my iperf version and details: $ iperf --v iperf version 2.0.5 (08 Jul 2010) pthreads The…
Nodir Kodirov
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PyQt4: QProcess starting iperf3 unable to connect to server

here's what I'm trying to do: build GUI program using PyQt4 to make testing connection between 2 computers easier (to minimize human errors). So, part of this program is to use QProcess to begins the iperf3, acting as either client or server. …
IceDragon6273
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Manually send to iperf via UDP socket? (C++)

I have a program that needs to measure total loss after routing through a machine. Essentially, I generate UDP traffic with iperf on machine A that is destined for machine C. However, I first route this traffic through machine B**, then send it to…
Ashkay
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