scroll_lines man page on HP-UX

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scroll_lines(5)						       scroll_lines(5)

NAME
       scroll_lines - number of scrollable lines used by the Internal Terminal
       Emulator

VALUES
   Failsafe
   Default
   Allowed values
   Recommended values
       No larger than is sufficient for a user's purposes.

DESCRIPTION
       This tunable specifies the total number of scroll buffer lines used  by
       the  HP-UX  graphics  console  Internal	Terminal Emulator (ITE).  This
       value is the sum of both on-screen and off-screen lines.	 For instance,
       if  the	ITE  has  68 on-screen lines, and the value of scroll_lines is
       128, then there will be 60 off-screen lines that can be	scrolled  back
       into view.

       During  boot, the system may adjust the value of upward, depending upon
       the installed graphics hardware.	 On graphics cards capable of  running
       at  more	 than one resolution, the ITE will first determine the maximum
       number of on-screen lines across all  possible  resolutions.   The  ITE
       will  then  ensure  that	 is at least equal to this number of on-screen
       lines.  For example, assume the graphics	 card  supports	 two  possible
       resolutions  which result in one ITE resolution of 160 characters by 62
       lines and another ITE resolution of 120 characters by 78 lines.	 If  a
       value  of  62  had been specified for in the system file, the ITE would
       then adjust this value upwards to 78.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       The value of can be increased if the user would like  to	 retain	 addi‐
       tional lines in the scroll buffer.

   What Are the Side Effects of Raising the Value of This Tunable?
       Increasing  the	size  of  the ITE scroll buffer consumes kernel memory
       which will be dedicated to the ITE and cannot be used  for  other  pur‐
       poses by the rest of the system.	 Memory is used at the rate of 2 bytes
       per off-screen character.

   When Should the Value of This Tunable Be Lowered?
       If the additional  off-screen  lines  in	 the  scroll  buffer  are  not
       required,  can  be  decreased to free up a small amount of memory.  The
       savings will be two bytes per off-screen character.  For	 instance,  if
       the  display is 160 characters wide, decreasing by 10 will free up 3200
       bytes.

   What Are the Side Effects of Lowering the Value of This Tunable?
       If is set below or equal to the number of lines displayed  on  the  ITE
       screen, no off-screen text will be accessible.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter 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 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

AUTHOR
       was developed by HP.

			   Tunable Kernel Parameters	       scroll_lines(5)
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