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CentOS is a community-supported, free and open source operating system based on Red Hat Enterprise Linux. It exists to provide a free enterprise class computing platform and strives to maintain 100% binary compatibility with its upstream distribution. CentOS stands for Community ENTerprise Operating System. CentOS developers use Red Hatâs source code to create a final product very similar to Red Hat Enterprise Linux. CentOS is available free of charge. Technical support is primarily provided by the community via official mailing lists, web forums, and chat rooms.
Hence, while you are on Centos 5.X 32 Bit Operating System machine without PAE support, user space and kernel space split would be like 3GB/1GB. That means, if you add physical memory more than 3 GB in your machine, your machine would not address it. This issue can be fixed by adding PAE support in Kernel.