suffer from performance decreases due
to increased system function overhead. Consider the history of Windows NT.
The first release had a layered microkernel organization. However, this version
delivered low performance compared with that of Windows 95. Windows NT
4.0 partially redressed the performance problem by moving layers from user
space to kernel space and integrating them more closely. By the time Windows
XP was designed, its architecture was more monolithic than microkernel.
Microkernel I Smaller Than A Nanokernel
Because the communication between different parts of the system is more complex in a microkernel.
mach
None. Solaris has a monolithic kernel.
by message passing
No version of Windows currently uses a microkernel
by message passing
The main advantages are that new services do not need to modify the kernel and it's easier to port between hardware. Also, microkernels provide more security because of less time in privileged mode.
The microkernel was designed to address the increasing growth of kernels and the difficulties that came with them. In theory, the microkernel design allows for easier management of code due to its division into user space services. This also allows for increased security and stability resulting from the reduced amount of code running in kernel mode. For example, if a networking service crashed due to buffer overflow, only the networking service's memory would be corrupted, leaving the rest of the system still functional.
It isn't. RTLinux is a separate microkernel that runs Linux as a process. The Linux kernel is essentially unmodified.
In computer science, a microkernel is the near-minimum amount of software that can provide the mechanisms needed to implement an operating system (OS).
Microkernels provide minimal process and memory management, in addition to a communication facility.