Patch Name: PHKL_0611

Patch Description: S700/Improve interactive performance on stressed VM system.

    Problem this patch addresses:

        During periods where a process quickly and continually absorbs all
        free physical memory, the system may appear to lock-up for anywhere
        between a few seconds to over a minute.  This creates delays in
        interactive response, and slows processes in general.

        The start-up phase of a large program is an example where a process
        quickly uses up physical memory.

    How this patch addresses the above problems:

        Installing the patch file vm_vhand.o will fix a defect in the
        page-out algorithm that contributed to the above problem.  There are
        other related problems not fixed by this patch, so this patch does
        not completely solve the problem.

        The improvement you see will depend on on type and severity of the
        programs/problems causing slow-downs you see.

        X/Vue response times are difficult to objectively measure, but seem
        to be about twice as fast under some conditions.

        Also, these changes were tested with a simple set of programs that
        tested response times while another batch program used up free
        memory as fast as possible.  Response times improved by about 5X.
        The batch program ran faster too.

        NOTE:  Even with these changes there can be still significant system
               delays, particularly when a large program starts up, this
               patch improves the situation, but does not always solve it.

Path Name: /hp-ux_patches/s700/8.X/PHKL_0611

Effective Date: 911118

Patch Files: /system/PHKL_0611/new/vm_vhand.o 

SR/APR#: None.

"what" string/timestamp:
vm_vhand.o:
        PATCH_8.05:  vm_vhand.o  1.10.61.6  91/11/18

"sum" output:
39807 12 vm_vhand.o

Dependencies:  Applies only to 8.05 kernels.

Supersedes: None.

Patch Package Size: 30 Kbytes

Installation Instructions: 

     Please review all instructions and the Hewlett-Packard
     SupportLine User Guide or your Hewlett-Packard support terms
     and conditions for precautions, scope of license,
     restrictions, and, limitation of liability and warranties,
     before installing this patch.

     Note: Please back up your system before you patch.

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After getting the patch onto your machine, unshar the patch (sh PHKL_0611).

To install this patch do the following:
1) Run the update program (Note: you must be logged in as root to update
   a system).
2) Once in the update "Main Menu" move the highlighted line to "Change
   Source or Destination ->" and press "Return" or "Select Item".
3) Make sure the highlighted item in the "Change Source or Destination"
   window is "From Tape Device to Local System ...", then press "Return" or
   "Select Item".
4) You should now be in the "From Tape Device to Local System" window.
   Change the "Source:  /dev/rmt/0m" to "Source: /tmp/PHKL_0611.updt" 
   (this assumes that you are in the /tmp directory where PHKL_0611.updt
   has been placed).  Note: You must enter the complete path name.
5) Press "Done".
6) From here on follow the standard directions for update.

The customized script that update runs will move the original software 
to /system/PHKL_0611/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHKL_0611.text file to /system/PHKL_0611 to be retained for
future reference.

If you wish to put this patch on a magnetic tape and update from the tape
drive, dd a copy of the patch to the tape drive.  As an example the
following will create a copy of the patch that update can read:
dd if=PHKL_0611.updt of=/dev/rmt/0m bs=2048