An Efficient Web Cluster with Content-Aware Request Distribution on Linux Kernel 2.6

Abstract

The web cluster has been commonly used in popular web sites because of its high availability and scalability.Many researches on web clusters have focused on content-aware request distribution beause dispatching requests from clients to servers according to the content of request (i.e. URI) can obtain better system performance and achieve hight locality in back-end servers' main memory caches.Inour previous word,we have proposed the TCP Rebuilding mechanism and the fast handshaking mechanism to build a content-aware web cluster named LVS-CAD on Linux kernel 2.4.In this paper,to gain performance improvement from new features in kernel 2.6,we have implemented the LVS-CAD on kernel 2.6.18.Besides,in order to make LVS-CAD platfrom easier to maintain and debug,we have also implemented the related mechanisms as Linux loadable kernel moduled that can be dynamincally loaded/unloaded into/from Linux kernel.Moreover,we have proposed and implemented amechanism to reduce excess multiple handoffs under persistent connection to further improve performance of a seb cluster.This enhanced LVS-CAD is named LVS-eCAD.Experimental results show that LVS-CAD on Linux kernel 2.6 can perform 158.22% better than LVS-CAD on Linux kernel 2.4 and LVS-eCAD can outperform LVS-CAD and LVS by 25% on Linux kernel 2.6.