xfr is a modern iperf3 alternative with a live TUI, multi-client server, and QUIC support.
This is free and open source software.
Features include:
- Live TUI with real-time throughput graphs and per-stream stats
- Server dashboard – xfr serve –tui for monitoring active tests
- Multi-client server – handle multiple simultaneous tests
- TCP, UDP, and QUIC with configurable bitrate pacing and parallel streams
- Single-port TCP – firewall-friendly, only port 5201 needed (no ephemeral data ports)
- Bidirectional testing – measure upload and download simultaneously
- Multiple output formats – plain text, JSON, JSON streaming, CSV
- Result comparison – xfr diff to detect performance regressions
- LAN discovery – find xfr servers with mDNS (xfr discover)
- Prometheus metrics – export stats for monitoring dashboards
- Config file – save defaults in ~/.config/xfr/config.toml
- Environment variables – XFR_PORT, XFR_DURATION overrides
Website: github.com/lance0/xfr
Support:
Developer: lance0
License: MIT License or Apache License 2.0
xfr is written in Rust. Learn Rust with our recommended free books and free tutorials.
| Explore Linux | |
|---|---|
 | Best Free and Open Source Software - A huge collection of recommended free and open source software covering every major category. |
 | In-depth Linux Software Reviews - Detailed assessments of Linux software covering features, usability and overall quality. |
 | The Big List of Active Linux Distros - An extensive collection of actively developed Linux distributions. |
 | Open Source Alternatives - Alternatives to software and services from Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle and others. |
 | Essential Linux System Tools - Indispensable utilities for monitoring, maintaining and managing Linux systems. |
 | Linux Productivity Tools - Useful utilities for improving productivity and streamlining everyday tasks. |
 | Alternatives to Popular CLI Tools - Modern alternatives to familiar command-line utilities supplied with Linux systems. |
 | Awesome Free Linux Game Tools - Tools, utilities and companion software that improve gaming on Linux. |
 | Machine Learning on Linux - Machine learning and deep learning software, self-hosted applications and practical tools. |
 | Saving Money with Linux - Practical ways to reduce electricity consumption and lower computing costs with Linux. |
 | Linux Candy - Fun, entertaining and sometimes delightfully quirky software from the lighter side of Linux. |
Please read our Comment Policy before commenting.