All the modification to kernel code are under directory "kernel_changes". Since I was using version 3.16.3, a patch based on that version is provided, as "VirtualTime.patch". Alternative way to modify and build virtual time enabled kernel:

• Download kernel 3.16.3 from The Linux Kernel Archives. Unzip it.

tar -zxvf linux-3.16.3.tar.gz

• Under "kernel_changes" directory, run following script so that source files under kernel_changes will replace orignal kernel code

./transfer.sh /Path/To/UnzippedKernel

• Change directory to unzipped kernel
  • You may need to configure kernel first. A easy way is to use existing configure file in your system

   cp -vi /boot/config-`uname -r` .config
   yes "" | make oldconfig
  

  • To compile kernel, modules and install them, you can run my script

   sudo ./build_all.sh
  

  • You may need to configure GRUB so that you can select which kernel to boot

  sudo vim /etc/default/grub
  GRUB_HIDDEN_TIMEOUT=15
  GRUB_HIDDEN_TIMEOUT_QUIET=false
  update-grub
  

  • Reboot and select the right kernel image in grub menu.

Since original Mininet-Hifi is keeping evolving and I forget which exact commit I was working on when developing virtual time, I do not think do an automatic patch here is very helpful (although I can guarantee you that my VT-Mininet is based at least on Mininet 2.1.0). Here I just provide full source of VT-Mininet. Since Mininet itself depends on many softwares:

OpenFlow, Open vSwitches
gcc, make, socat, psmisc, xterm, ssh, iperf3/iperf, iproute, telnet 
python-setuptools, cgroup-bin, ethtool, help2man, pyflakes, pylint, pep8

I recommend you take a look at mininet/util/install.sh and resolve the dependency first. A easier way is to first install original Mininet, them replace it with my VT-Mininet code and reinstall by running

sudo make clean
sudo make install

Tips: you may need to repeat clean-install twice.

My implementation of virtual time is actually inspired by that of Jeremy Lamps. Great thanks for sharing his source code and providing a very detailed documentation.

coming soon...