intr_strobe_ics_pct man page on HP-UX

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intr_strobe_ics_pct(5)					intr_strobe_ics_pct(5)

       intr_strobe_ics_pct  -  limit  for  the	percent of time a processor is
       allowed to spend in interrupt context

   Allowed values
       Setting to will switch the feature off.

   Recommended values
       specifies the system limit for the  percent  of	time  a	 processor  is
       allowed	to  spend  in interrupt context.  When the tunable is set to a
       value less than the kernel does not allow I/O interrupts to consume the
       processor time beyond the set limit and hence the threads and other low
       priority interrupts get time to execute.	 This is  important  when  the
       system is under a heavy I/O interrupt load and some threads like heart‐
       beat timer in service guard environment need to run  within  a  limited
       time delay.

       In the normal working of the system, the value of the tunable should be

       If is to less than a message like the following may be seen in the mes‐
       sage buffer.

       The message buffer can be read via or This message indicates  that  the
       percent	of time spent on the processor crossed the specified limit and
       corrective action has been taken.

   Who Is Expected to Change This Tunable?
       Only HP Field engineers should change the value of this tunable.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Value of This Tunable Be Lowered?
       The value should be lowered only when heavy I/O interrupt load is caus‐
       ing a time critical process to timeout.

   What Are the Side Effects of Lowering the Value?
       Reducing	 the  value  of the tunable would give the thread context more
       time to execute.	 However, the overall system throughput may decrease.

   What Other Tunable Values Should Be Changed at the Same Time?
       This tunable is independent of other tunables.

       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  may	 be  removed or have its meaning changed in future releases of

       Installation of optional kernel software, from HP or other vendors, may
       cause  changes  to  tunable parameter values.  After installation, some
       tunable parameters may no longer be at the default or recommended  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

       was developed by HP.

       kctune(1M), kcweb(1M).

			   Tunable Kernel Parameters	intr_strobe_ics_pct(5)

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