KVM虛擬機性能優化

參考三個博客：

http://www.lmyw.net.cn/?p=875

http://blog.csdn.net/beginning1126/article/details/41983547

http://www.pubyun.com/blog/cloud/kvm%E7%A3%81%E7%9B%98%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96/

http://join12.blog.51cto.com/1194785/1104333

http://bbs.linuxtone.org/thread-22625-1-1.html