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Linux with the PREEMPT_RT patches differs from a small kernel chiefly in

  • A.needing far more memory and offering longer worst-case latencies
  • B.being unable to preempt a running task at all
  • C.providing no timers or timeouts to applications
  • D.running only upon processors that lack a memory management unit altogether

Answer: A

A full kernel with drivers, a network stack and a filesystem brings enormous capability and latencies measured in tens of microseconds rather than single microseconds. Which matters depends entirely on the deadline in question.

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