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The Linux kernel is the core of the operating system, acting as a layer between the hardware and all other processes. The kernel provides for memory management, multi-tasking, input/output, networking, and many other functions. Since Linux is open source software, access to the source code for the Linux kernel is freely available. This means that anyone is free to customize and recompile the kernel to suit their specific needs. In fact, the kernel is designed in a modular fashion that allows users to remove parts of the kernel that are not needed for the intended purpose of the machine.

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When thinking of customizing and recompiling the kernel, you may have visions of sorting through thousands of lines of C code, but that is not the case. Unneeded kernel modules can be removed without editing a single line of code. Having said that, recompiling the kernel is not something that needs to be done frequently or on a whim. Granted, there are many people who recompile their kernels every other day just for fun, but it’s usually unnecessary unless they are kernel developers. Tools exist to make the configuration and compilation process easier, but it is still a rather complex process.
A combination of failing to make proper backups of the old kernel and errors in the compilation process can result in a system that does not function correctly or that does not boot up at all!

Kernel Version Numbers

The Linux kernel version numbers consist of three numbers separated by decimals, such as 2.2.14. The first number is the major version number. The second number is the minor revision number. The third number is the patch level version.
At any given time there is a group of kernels that are considered “stable releases” and another group that is considered “development.” If the second number of a kernel is even, then that kernel is a stable release. For example, the 2.2.14 kernel is a stable release because the second number is even. If the second number is odd, then that kernel is a development release. For example, the 2.3.51 is a development release because the second nubmer is odd.
Once the 2.3.x branch is considered finished, then it will become the 2.4.0 kernel. Patches will then appear for the 2.4.x branch and development work will begin on the 2.5.x branch. If the 2.3.x advancements are significant enough to be considered a major revision, the 2.3.x branch will become 3.0.0 and development work will begin on the 3.1.x branch.

Is Recompiling The Kernel Necessary?
Is recompiling the kernel necessary? That depends on your situation (and who you ask). Here are a few things to think about when considering recompiling your kernel:

New kernels are released rather frequently and the difference between two consecutive patch levels is usually minimal. Updating your kernel every time a new kernel is released is usually pointless unless the new version addresses an issue that directly affects you.

In the past, the kernel was not as modular as it is today. This means that older kernels used to load many unneeded modules into memory, thus increasing system load and also increasing the chances that bugs in those unneeded modules could adversely affect the system. Recompiling the kernel to remove the unneeded modules had noticeable benefits. Newer kernels, however, usually load modules into memory only when they are needed. Manually removing these modules has little positive effect since they are not called by the kernel anyway.

Recompiling the kernel may be necessary if new hardware is added to the system that the current kernel does not support. For example, a system with a dual processor motherboard but only one processor installed most likely has a kernel that supports only one processor. If a second processor is installed at a later date, the kernel must be recompiled to support symmetric multi-processing (SMP) in order to utilize the second processor.

The process of compiling the kernel places a heavy load on the system, especially the RAM. On a busy server, there is be a noticeable degradation of system performance. Also, after the kernel has been compiled and installed, the system must be rebooted so that the new kernel can be used. Depending on the role of the machine, the downtime involved with rebooting the server can be costly. Consideration should be given to the items listed above before recompiling the kernel.

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