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ebpf-performance

Set up 3 machines

One to be test controller and kubernetes master, the others to be kubernetes workers Ubuntu 20.04

Install prerequisite software on test controller

sudo apt-get install jq

Set up a non-root user on each machine

Allow the test controller to 'ssh' to the worker machines

Clone the repositories onto the test controller

cd
mkdir workspace
cd workspace
git clone [email protected]:ykt-networking/ebpf-performance-results.git
git clone [email protected]:ykt-networking/ebpf-performance.git

Clone the repository onto the workers

cd
mkdir workspace
cd workspace
git clone [email protected]:ykt-networking/ebpf-performance.git

Enable the workers to access kernel symbols

This step needs to be repeated after every reboot of the workers

sudo sh -c "echo 0  > /proc/sys/kernel/kptr_restrict"
sudo sh -c "echo -1 > /proc/sys/kernel/perf_event_paranoid"

Install 'perf' on the workers

The packages to install are dependent on the kernel level. If you issue 'perf' you will be told a package to install for the 'perf' command. Install this and issue 'perf' again. Then you will be told 2 more packages to install. Here are the packages that were required on my machine

sudo apt install linux-tools-common
sudo apt install linux-tools-5.4.0-1028-ibm linux-tools-ibm

Start Kubernetes with the chosen CNI

Starting Kubernetes and configuring a CNI is beyond the scope of this README.

Run the test

On the master node, issue commands

cd
cd workspace/ebpf-performance
./run_flamegraph tjcw-kube-1 tjcw-kube-2 /home/tjcw/workspace/ebpf-performance-results/test-directory

This assumes the worker nodes are called tjcw-kube-1 and tjcw-kube-2 , and you want the results placed in directory test-directory of repository ebpf-performance-results

Browse the resulting flamegraphs

On my Linux Thinkpad, the commands for this are

cd
cd eclipse-workspace-java/ebpf-performance-results
git fetch origin
git merge --ff-only origin/main

and browse to URL file:///home/tjcw/eclipse-workspace-java/ebpf-performance-results/test-directory/server-flamegraph.svg or file:///home/tjcw/eclipse-workspace-java/ebpf-performance-results/test-directory/client-flamegraph.svg . There are some additional files placed in this directory :

  • client.cpu : Reported client CPU time for the duration of the test
  • client_per_tick : Bits transferred per tick of client CPU
  • server.cpu : Reported server CPU time for the duration of the test
  • server.log : Last 10 lines of the server iperf3 output
  • server_per_tick : Bits transferred per tick of server CPU