Dummynet Installation

From Wiki

This site includes the installation HowTO to install dummynet on the system.

Contents 1 ToDo 2 Installation 3 Files 4 Dummynet Modification 5 Links

ToDo

• Write a complete HowTo for installing and running DUMMYNET

Installation

• Copy GENERIC to /usr/src/.../i386/GENERIC

 cp GENERIC /usr/src/

• Rebuild the kernel again

• Run the tuning script

 #!/bin/tcsh
 sysctl -w kern.polling.enable=1
 sysctl -w kern.polling.user_frac=5
 sysctl -w kern.polling.burst_max=400
 sysctl -w kern.polling.each_burst=15
 sysctl -w net.inet.ip.intr_queue_maxlen=1000
 sysctl -w net.inet.ip.dummynet.hash_size=256
 sysctl -w kern.ipc.maxsockbuf=900000000
 sysctl -w net.inet.tcp.sendspace=300000000
 sysctl -w net.inet.tcp.recvspace=300000000
 sysctl -w net.inet.udp.recvspace=300000000
 gcc -o dummylog dummylog.c

Files

• download sources
  • FreeBSD 5.2.1 - GENERIC, if_em.h, and ipfw2.c ip_dummynet.c ip_dummynet.h
  • FreeBSD 5.3 - GENERIC, loader.conf ip_dummynet.c ip_dummynet.h

Dummynet Modification

You can use any one of these modifications to introduce RTT by per-flow basis. When I wrote the patches for FreeBSD 5.2.1 and 5.3, I couldn't get the real data of IMC03, so I used an exponential distribution that follows a similar distribution with the real data. Also, I found the patch that exactly use the distribution sampled from IMC'03 paper at the original author's site.

• Dummynet modification for FreeBSD 5.3 download sources
• Dummynet modification for FreeBSD 5.2.1 download sources
• Dummynet modification for FreeBSD 4.5 from an original author of IMC'03 paper[1], source codes[2] based on FreeBSD 4.5

Links

• FreeBSD Handbook

---

Maintained by Sangtae Ha (sangtae.ha AT gmail DOT com)