Largely based on: https://github.com/majek/openonload/blob/master/src/tests/onload/hwtimestamping/rx_timestamping.c
make- linuxptp:
sudo apt install linuxptp - rust:
sudo apt install cargo
Build with make run with make run.
Before the tool is run the time the time between the kernel and the NIC has to be synchronized with phc2sys: sudo phc2sys -s enp65s0f0np0 -O 0 -m
phc2sys must run in the background for the whole experiment.
phc2sys is avaliable in the linux PTP tools (linuxptp package mentioned above). You can also find its source code at git://git.code.sf.net/p/linuxptp/code
hw-timestamping listens for UDP packets.
The Rust application in ./rust-packets can be used to create these packets: cd rust-packets; cargo build --release.
By default, the application assumes eth0 to be the interface you want to use:
$ sudo cargo run --release # will use eth0
You can pass the name of the interface you want to use as the first argument:
$ sudo cargo run --release enp65s0f0np0 # will use enp65s0f0np0
The result of the experiment is a file with all the measured latency numbers called latency.txt.
Use the python script summarize.py to create a plot of the numbers.
Successfully tested on the following platform:
- Ubuntu 22.04
- Linux kernel 5.15.0-69
- Rust 1.72.1
- Mellanox ConnectX-5 25Gb NIC
Slides for PTP tools