title: fast interupt handler needed
body: <p>I have an external device attached to my arm board that generates interrupts in microsecond interval.
  What I want is a fast irq handler that can just get the jiffies timestamps into an array.</p>
  
  <p>The linux irq handler is acquiring most of the irqs but not really running all the handlers. I am getting 10 ms time for an irq that should run every 25 microsecond. Some handlers have run with 0 delay. Looks like they got queued. How to get a real time IRQ handler?</p>
  
  <p>I am using a qualcomm 800 series board which is really fast.</p>