Flent

Spec sheet

Purpose

Flent wraps netperf and similar tools to run predefined network tests, aggregate results, and plot them, primarily to test for bufferbloat.Read 4 Oct 2026 · flent.org

Intended users

The project describes Flent as a tool for making network experiments more reliable and easier to perform.Read 4 Oct 2026 · flent.org

Additional measurements

It can collect CPU usage, WiFi, qdisc, and TCP socket statistics as secondary data series.Read 4 Oct 2026 · flent.org

Automation

Batch experiment runs can automate testing regimes.Read 4 Oct 2026 · flent.org

Data capture

It can capture metadata from local and remote hosts and store it with plot data.Read 4 Oct 2026 · flent.org

Desktop GUI

An interactive plot viewer is available, and the macOS installation instructions list PyQt5 and qtpy as optional GUI dependencies.Read 4 Oct 2026 · flent.org

Outputs

Aggregated results can be saved as gzipped JSON or output as CSV, Org tables, and plots.Read 4 Oct 2026 · flent.org

Plot formats

Plots can be saved in formats supported by matplotlib, including PNG, PS, PDF, and SVG.Read 4 Oct 2026 · flent.org

Repeatable tests

It combines benchmarking tools into aggregate, repeatable test runs.Read 4 Oct 2026 · flent.org

Supported installs

The site lists installation options for Linux distributions, FreeBSD, and macOS.Read 4 Oct 2026 · flent.org

Tools and dependencies

Most tests use netperf 2.6 or later, while some use iperf; both tools must be available in PATH for the tests that use them.Read 4 Oct 2026 · flent.org

UDP measurements

The documentation recommends irtt for UDP measurements and says its server must run on target hosts.Read 4 Oct 2026 · flent.org

Plans and prices

Every Flent plan and price →

Where Specifiction places it

• Network Testing Software#16 of 337.8