Managing Users in a Global Environment

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LEARN ABOUT HPUX

intr_strobe_ics_pct

intr_strobe_ics_pct(5)						File Formats Manual					    intr_strobe_ics_pct(5)

NAME

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

VALUES

   Failsafe
   Default
   Allowed values
       Setting to will switch the feature off.

   Recommended values
DESCRIPTION

       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
       heartbeat 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 message 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 causing 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.

WARNINGS

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

       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 values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

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

							     Tunable Kernel Parameters					    intr_strobe_ics_pct(5)

UNIX for Advanced & Expert Users