title: Disadvantage(s) of preempt_rt
body: <blockquote>
    <p>the target hardware platform has limited horsepower, and/or you want
    the real-time job to put the smallest possible overhead on your
    system. This is where dual kernels are usually better than a native
    preemption system.</p>
  </blockquote>
  
  <p>From here: <a href="http://www.xenomai.org/index.php/Xenomai:Roadmap#Xenomai_3_FAQ" rel="noreferrer">http://www.xenomai.org/index.php/Xenomai:Roadmap#Xenomai_3_FAQ</a></p>
  
  <p>Preempt_rt does preempt the whole Linux. In what way does preempting Linux put load on the system? </p>
  
  <p>The FAQ there talks about the preempt_rt as compared to Xenomai.</p>