LVS改变ConnectionHashtable值

ck1987

　　一、软件包  
　　a) kernel-2.6.18-164.el5.src.rpm  
　　二、安装步骤  
　　a) Rpm –ivh kernel-2.6.18-164.el5.src.rpm  
　　b) Cd /usr/src/redhat/  
　　c) Cp /boot/config-2.6.18-164.el5PAE SOURCE/ kernel-2.6.18-i686.config  
　　d) Vi SOURCE/ kernel-2.6.18-i686.config  
　　e) 把第一行#改成# x386  
　　f) 修改CONFIG_IP_VS_TAB_BITS=12 （2的12次方，4096）为 CONFIG_IP_VS_TAB_BITS=20  
　　g) Cd SPECS  
　　h) Rpmbuild –ba kernel-2.6.spec  
　　i) Cd ../RPMS/X386/  
　　j) Rpm –ivh kernel-2.6.18-164.el5.rpm  
　　k) Vi /etc/grub.conf  
　　l) 修改default=0为1  
　　m) 重启服务器  
　　n) Ipvsadm由以前的  
　　o) IP Virtual Server version 1.0.12 (size=4096)  
　　p) 改变成IP Virtual Server version 1.2.1 (size=1048576)  
　　q) 编译内核的过程超漫长，差不多需要40分钟左右。  
　　三、附加  
　　a) Ipvsadm –timeout 100 80 100  
　　b) Ipvsasdm –ln –settimeout  
　　c) The IPVS connection hash table uses the chaining scheme to handle  
　　hash collisions. Using a big IPVS connection hash table will greatly  
　　reduce conflicts when there are hundreds of thousands of connections  
　　in the hash table.  
　　Note the table size must be power of 2. The table size will be the  
　　value of 2 to the your input number power. The number to choose is  
　　from 8 to 20, the default number is 12, which means the table size  
　　is 4096. Don't input the number too small, otherwise you will lose  
　　performance on it. You can adapt the table size yourself, according  
　　to your virtual server application. It is good to set the table size  
　　not far less than the number of connections per second multiplying  
　　average lasting time of connection in the table. For example, your  
　　virtual server gets 200 connections per second, the connection lasts  
　　for 200 seconds in average in the connection table, the table size  
　　should be not far less than 200x200, it is good to set the table  
　　size 32768 (2**15).  
　　Another note that each connection occupies 128 bytes effectively and  
　　each hash entry uses 8 bytes, so you can estimate how much memory is  　　needed for your box.