Xen

Ganeti
Ganeti is a cluster virtual server management software tool built on top of existing virtualization technologies such as Xen or KVM and other Open Source software.
http://code.google.com/p/ganeti/


http://www.serverwatch.com/news/article.php/3770221/Hypervisor-Face-Off-KVM-vs-Xen-vs-VMware.htm

"KVM benchmarking is extremely selective," Crosby commented. "Where it does benefit in performance, it does so by sacrificing what we view as fundamental security concerns for enterprise virtualization deployments. Xen's deep separation of trust domains costs a bit in performance but provides the hard-line separation required for any secure deployment of virtualization."


Bruce also noted KVM relies on strong CPU performance with very limited support for para-virtualization. As such, Bruce argued it is difficult to achieve top performance in a KVM virtualized environment without powerful hardware underneath. Conversely, in his view, Xen offers strong support for para-virtualization for modified Windows guests and modified Linux guests to achieve near-native performance.


http://virt.kernelnewbies.org/TechComparison - features and performance of the various virtualization technologies available for Linux


Diff between para virtualization and hardware assisted virtualization

To run OS unmodified on Xen , u need a cpu that support hardware virtualization. You need to use HVM in Xen to run Windows.

http://www.virtuatopia.com/index.php/An_Overview_of_Virtualization_Techniques

xen live cd
http://wiki.xensource.com/xenwiki/LiveCD
Xenoppix http://unit.aist.go.jp/itri/knoppix/xen/index-en.html

installing Windows on Xen
http://www.virtuatopia.com/index.php/Virtualizing_Windows_Server_2008_with_Xen
http://mediakey.dk/~cc/howto-install-windows-xp-vista-on-xen/

wifi
http://wiki.xensource.com/xenwiki/XenWifi - sharing a wireless nic between dom0 and domU.

You might need http://ebtables.sourceforge.net/ if your wireless NIC does not allow packets with a MAC that is different from its own.




Xen setup docs that i found:

http://www.virtuatopia.com/index.php/Xen_Virtualization_Essentials

Xen on OpenSuse
http://en.opensuse.org/Installing_Xen3

Xen on Debian 5
http://www.howtoforge.com/virtualization-with-xen-on-debian-lenny-amd64

xen tools http://www.debian-administration.org/articles/533

http://wiki.xensource.com/xenwiki/HowTos
http://www.howtoforge.com/perfect_setup_xen3_debian
http://www.packtpub.com/files/Xen-Virtualisation-Sample-Chapter-Chapter-2-Running-Xen.pdf
http://www.howtoforge.com/xen_gui_fedora_7_desktop