比较Xen和KVM

以下是我写的英文笔记。

Summarizing all I learned from the web articles, I make a table as below:

Xen’s strong points:
1. Enter market earlier than kvm. Some big bugs, e.g., Amazon and Citrix are already using it.  It won’t go away soon.
2. There are some good GUI tools available there, e.g.,  from Citrix
3. Its performance is not bad, at least doesn’t fall very far behind KVM.

Xen’s shortcomings:
1. Needs linux distro’s support.  Although most linux distro’s have support xen already, but we need to consider this when we are deploying Xen.  RHEL linux may have better support in KVM than in Xen. 

KVM’s advantages:
1. Architecturally better.  Its design lets it utilize many existing, well-tested functions in linux kernel, does not have implement things like memory management, scheduler on its own. it should enjoy better performance. 
2. Better community support (?).  Linux kernel has a larger community than Xen, and it also has the downstream distro to test and report bugs.  Given enough eyeballs, all bugs are shallow.  
3. Almost every feature that Xen has, it can be implemented in KVM as well.  


References:
1. http://www.linux.com/news/enterprise/systems-management/327628-kvm-or-xen-choosing-a-virtualization-platform
2. http://major.io/2014/06/22/performance-benchmarks-kvm-vs-xen/