how to update kernel

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Hi

I have a trouble with centOS 4 

The process kswapd0 eat almost all my memory space, and also this process
get almost 100 percent of cpu, and the box go slow

I have read that this problem is fix when the kernel is upgrade but I do not
know hot to update my kernel. when I type yum list \kernel*  I get the
following list:

[xxx@xxxxxx]# yum list \kernel*
Setting up Repos
addons                    100% |=========================|  951 B    00:00

base                      100% |=========================| 1.1 kB    00:00

update                    100% |=========================|  951 B    00:00

extras                    100% |=========================| 1.1 kB    00:00

Reading repository metadata in from local files
addons    : ################################################## 2/2
base      : ################################################## 1404/1404
update    : ################################################## 80/80
extras    : ################################################## 25/25
Installed Packages
kernel.i686                                  2.6.9-5.0.3.EL
installed       
kernel-smp.i686                           2.6.9-5.0.3.EL         installed

kernel-utils.i386                           1:2.4-13.1.48
installed       
Available Packages
kernel.i586                                  2.6.9-5.0.5.EL         update

kernel.i686                                  2.6.9-5.0.5.EL         update

kernel-devel.i686                          2.6.9-5.0.5.EL         update

kernel-devel.i586                          2.6.9-5.0.5.EL         update

kernel-doc.noarch                        2.6.9-5.0.5.EL         update

kernel-hugemem.i686                   2.6.9-5.0.5.EL         update

kernel-hugemem-devel.i686           2.6.9-5.0.5.EL         update          
kernel-smp.i686                           2.6.9-5.0.5.EL         update

kernel-smp.i586                           2.6.9-5.0.5.EL         update

kernel-smp-devel.i586                   2.6.9-5.0.5.EL         update

kernel-smp-devel.i686                   2.6.9-5.0.5.EL         update

kernel-sourcecode.noarch             2.6.9-5.0.5.EL         update  


I know that i have to update kernel.i686 2.6.9-5.0.5.EL and kernel-smp.i686
2.6.9-5.0.5.EL but I am not sure what are the steps or instructions that I
should follow to get it

Regards
Mario

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