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Questions tagged [iperf3]

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.

65 questions
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iperf3 - Meaning of Retr column in TCP measurement

Sorry for asking this topic, but after reading the tool's documentation and the similar ticket to my question (https://github.com/esnet/iperf/issues/343), I still don't really understand/know the meaning of the Retr column in a TCP measurement, and…
Robert Balogh
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iperf3 Windows bandwidth is much slower than linux

I have encountered a very strange issue. I have 2 servers, one runs redhat Linux server 7 64Bit, ahother runs Windows server 2012 64Bit. Both server hardware spec is exactly same: Xeon 2.6Ghz CPU x 2, total 32 logical core 96GB ddr4 memory 1Gb dual…
Li JianMing
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how to modify Iperf TCP connection timeout?

I am using mininet for emulation of a network. My network has a delay of 3000ms(linear topology of 3 switches).When I tried to do iperf I got Connection failed : No route to host error in client. After a lot of time with the help of internet i came…
Vinay
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iperf3: unable to create a new stream

I have 2 users on a system. One user is able to provide all the logs for iperf3 installed on the system. But second user gives error as: iperf3: error - unable to create a new stream: No such file or directory Does iperf3 requires some specific…
Nikita
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Running Iperf Server and Client using Multithreading in Python causes Segmentation fault

A main class calls two other classes(IperfServer and IperfClient) and I'm trying to run them using multithreading. I am using the python wrapper class for iperf3. Both the classes are initiated but while running Iperf, I get segmentation Fault. CODE…
Mahalakshmi Suresh Kumar
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iperf and iperf3 shows different network bandwidths

I am trying to understand the difference between iperf (version=2.0.8b) and iperf3 (version=3.15) which are showing different network bandwidths between the two VMs and with same parameters. When I run "iperf -s" on server and "iperf -c -t 30 -P 8"…
NKD
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run iperf in background and redirect output to a file

I am trying to start iperf server in background and redirect the output to a file. But it is not working. server: iperf3 -s -D >> /tmp/listen.txt or iperf3 -s -D > listen.txt client: iperf3 -c -B > send.txt I am…
user5154816
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fgets stuck when reading from an external process pipe

I'm calling iperf3 from via popen and read from its output into a string. #include #include using namespace std; int main() { string peer_ip = "localhost"; string iperf_cmd = "iperf3 -c " + peer_ip + " -t 1" + " -R…
foki
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How to connect two docker containers to openvswitch+DPDK

I'm trying to test the throughput between two docker containers using Iperf3 (any throughput tester app) connected to OVS (openvswitch) and DPDK on ubuntu 18.04 (VMWare workstation). The goal of this is to compare the performance of OVS-DPDK vs…
Mohammad Siavashi
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Flutter (Dart) ffi - Aplication freezes during processing external library methohd

I am using C library iperf3 to measure network. When I start network testing my aplication freezes and wait for results. I tried async and threads but any progress. Any advise? I'd like to run my test and asynchronously call another methods (at…
Miroslav Brandýský
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Using iperf3 for measuring UDP throughput on STM32 board

I have STM3220G-Eval board with STM32F207 MCU. I've loaded UDP Echo Server lwIP based sample application (from CubeMX archive). This app used port #7. I've tried to use iperf3 in client mode (Windows OS), but it failed to work with the board (though…
ilya
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iperf3 results in packets per second?

Can iperf3 report measurements also in terms of packets per second, when generating UDP traffic? A typical output with the verbose mode is the following: Test Complete. Summary Results: [ ID] Interval Transfer Bandwidth Jitter …
Ricky Robinson
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Iperf3 - Put hour/minutes/seconds at the beginning of each line

I'm currently trying to launch a very long Iperf test on my infrastructure, so I'm developing some powershell script in order to do the tests. To analyses the results, I want to have the hour/minutes/seconds of each new packet sends per lines on my…
Pieo
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Running iperf with telegraf to log results into influxdb

To avoid an xy problem, I am trying to log/graph/alert on iperf results to several different iperf servers on our network. We have been having problems with inconsistent and slow traffic over our metro ethernet provider. If someone has a better way…
bmont
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SSD read/write measurement using iperf3

is it possible to measure the read/write speed on an SSD drive by connecting it to a PC and using iperf?
Isaac Moradov
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