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Cause(s) of interrupt stack activity?

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The Question is:

Oh wizzard, in a world where OpenVMS is the Ultimate high end Operating System,
 why does my turbolaser's primary CPU become 100% consumed with interrupt stack
 time when processing I/O on Fibre Channel (KGPSA) connected disk drives?

The Answer is :

  Well, because something is causing the interrupt stack activity.
  Please contact the Compaq Customer Support Center, as rather more
  detail on the environment and the activity will be required.

answer written or last revised on ( 6-JUN-2000 )

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