Ethr is a Network Performance Measurement Tool for TCP, UDP & HTTP.
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girishmotwani and pgmsft tcpstats for OS X (#30)
Use low level syscall to fetch the tcpstats

Use cgo to get the systems definition for struct tcpstats.

This makes the solution portable across different versions of the OS.
Latest commit a8b80fc Dec 13, 2018


Ethr is a cross platform network performance measurement tool written in golang. The goal of this project is to provide a native tool for network performance measurements of bandwidth, connections/s, packets/s, latency, loss & jitter, across multiple protocols such as TCP, UDP, HTTP, HTTPS, and across multiple platforms such as Windows, Linux and other Unix systems.

Ethr server in action

Ethr takes inspiration from existing open source network performance tools and builds upon those ideas. It is very similar to iPerf3 for bandwidth measurements for TCP. iPerf3 has many more options for doing bandwidth measurements such as throttled testing, richer feature set, while Ethr has support for multiple threads, the ability to scale to 1024 or even higher connections, multiple clients to a single server etc. It is similar to latte on Windows or sockperf on Linux for doing latency measurements.

Ethr is natively cross platform, thanks to golang, as compared to compiling via an abstraction layer like cygwin that may limit functionality. It hopes to unify performance measurement by combining the functionality of tools like iPerf3, ntttcp, psping, sockperf, and latte and offering a single tool across multiple platforms.

Ethr provides more test measurements as compared to other tools, e.g. it provides measurements for connections/s, packets/s and latency, all in a single tool. In the future, there are plans to add more features (hoping for others to contribute) as well as more protocol support to make it a comprehensive tool for network performance measurements.


For Windows 10:
For Ubuntu:
For ArchLinux:


Note: go version 1.10 or higher is required building it from the source.

Building from Source

git clone
cd ethr
dep ensure -v
go build

Using go get

go get

Using ArchLinux AUR

Assuming you are using yay (

yay -S ethr


Simple Usage


ethr -h


ethr -s

Server with Text UI:

ethr -s -ui


ethr -c <server ip>


// Start server
ethr -s

// Start client for default (bandwidth) test measurement using 1 thread
ethr -c localhost

// Start connections/s test using 64 threads
ethr -c localhost -t c -n 64

Complete Command Line

Common Parameters

-h                        Help
-no                       Disable logging to a file
-o <filename>             Log to the file specified by filename.
                          By default Ethr logs to ./ethrs.log for server & ./ethrc.log for client mode
-debug                    Log debug output

Server Parameters

-s                        Server mode
-ui                       Display text UI

Client Parameters

-c <server>                   Client mode, connect to name or IP specified by server
-t <b|c|p|l>                  Test to be done, b: bandwidth, c: connections/s, p: packets/s, l: latency
                              Default is bandwidth test
-p <tcp|udp|http|https|icmp>  Protocol to use, default is TCP
-n <number>                   Number of sessions/threads to use
-l <number>                   Buffer size to use for each request
-i <number>                   Number of iterations for latency test


Protocol Bandwidth Connections/s Packets/s Latency
TCP Yes Yes No Yes
UDP Yes NA Yes No
HTTP Yes No No No

Platform Support


Tested: Windows 10, Windows 7 SP1

Untested: Other Windows versions


Tested: Ubuntu Linux 18.04.1 LTS, OpenSuse Leap 15

Untested: Other Linux versions


No other platforms are tested at this time

Todo List

Todo list work items are shown below. Contributions are most welcome for these work items or any other features and bugfixes.

  • Test Ethr on other Windows versions, other Linux versions, FreeBSD and other OS
  • Support for UDP bandwidth & latency testing
  • Support for HTTPS bandwidth, latency, requests/s
  • Support for HTTP latency and requests/s
  • Support for ICMP bandwidth, latency and packets/s


This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.