Project Name

Understanding and Enhancing Linux Kernel-based Packet Switching on WiFi Access Points

Table of Contents

• Introduction
• Features
• Usage for perf and flamegraph
• Configuration
• Contributing
• License
• Contact

Introduction

This github page provides all testbed scripts and detailed data analysis scripts for Understanding and Enhancing Linux Kernel-based Packet Switching on WiFi Access Points paper.

Features

List the main components of this project:

• testbed (performance matrix) : 1.The meassurement process conducted automatelly. 2.The data from different servers retrieved automatically. 3.Testbed runs the first check for data validation. 4.Testbed will restart the testbed from the endpoint or unfinished tests

• Data_analysis: 1. Data analysis process find and use the valid time interval data. 2.Data analysis process will process the data for better visualization

• Figures

Steps

1. Clone the repository:

   git clone https://github.com/SIOTLAB/wifi-packet-switching-analysis.git

2. Navigate to the project directory:

   cd wifi-packet-switching-analysis/testbed

3. add configuration for all servers:

   vim ssh.json
   # add necessary server ip and passwd

4. start test.

   python3 ./pipeline.py

5. adjust the parameter of test if necessary

Usage for perf and flamegraph

1. Use perf to get the data of processor cycles

   perf record -e cycles:k -C 0,1 sleep 10

2. git clone Flamegraph

   git clone https://github.com/brendangregg/FlameGraph  # or download it from github

3. get the flamegraph

    perf script | ./FlameGraph/stackcollapse-perf.pl > out.perf-folded
    ./FlameGraph/flamegraph.pl out.perf-folded > perf.svg # view this graph in Firefox or chrome

Configuration

1. set Processor CPU affinity

   cat /proc/interrupts    #check the IRQ number of ethernet or wireless
   sudo su
   echo 2 > /proc/irq/xx/smp_affinity

2. other configurations that we needed in test

   sudo sysctl -w net.ipv4.ip_forward=1
   sudo iw wlan0 set power_save off
   sudo tc qdisc add dev eth1 root fq_codel
   sudo ethtool -K eth1 generic-segmentation-offload off
   sudo ethtool -K eth1 generic-receive-offload off
   sudo ethtool -K wlan0 generic-segmentation-offload off
   sudo ethtool -K wlan0 generic-receive-offload off
   sudo sysctl -w net.core.netdev_budget=300
   sudo sysctl -w net.core.netdev_budget_usecs=8000
   sudo sysctl -w net.core.dev_weight=64

3. use perf for l1-dcache invalidation and content-switching

   perf stat -e l1d-cache-invalidation -C 0,1 sleep 10
   perf stat -e context-switches -C 0,1 sleep 10

Contacts

Shiqi Zhang szhang9@scu.edu Mridul Gupta magupt@scu.edu Behnam Dezfouli bdezfouli@scu.edu