Some questions about kernel 2.6

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Hey,
 
We would like to run 2.6 on a server, but I have a question about some
options:
 
* Symmetric multi-processing support: 
  What happens if we enable this and run it on a uni-processor system?
Will it run slower?

* Preemptible Kernel:
  This should be used on a desktop PC. Is it better to enable or disable
it on a system that is used only as a server or firewall?

* Packet socket: mmapped IO:
  What is the effect of this? Is this the famous interruptless network?

How can we see if a network driver is running interruptless or not?

Thanks in advance,

Wouter

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