Patch Name:  PHNE_1056

Patch Description: Fix to tty driver for telnet performance problems on 8.0.

The symptom of this problem is performance degradation in block mode
applications running over telnet when moving from 7.x to 8.x. You will also
see an increase in lan utilization. Ironically, the problem is caused by the
8.0 transport being more efficient about sending data. Instead of coalescing
several application writes into one data packet, it sends out a packet for
each write. This can cause a huge (~10x) increase in the number of packets,
which can overwhelm a local system, especially terminal servers (including
DTCs) and PCs. This patch forces the tty driver to coalesce data into big
packets while maintaining the superior performance features of the 8.x
transport.

Path Name:  /hp-ux_patches/s700/8.X/PHNE_1056

Effective Date:  921215

Patch Files:  
    tty_nvs.o

SR#:  4701-097964

"what" string/timestamp:  
    tty_nvs.o:
         PHNE_1056:  tty_nvs.c,v $Revision:  1.2.185.4 $ $Date:
         92/11/25 10:07:12 $

"sum" output:  
    57890 17 tty_nvs.o

Dependencies:  HP-UX 8.05.

Supersedes:  None.

Patch Package Size:  41 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.

---------------------------------------------------------------------------
After getting the patch onto your machine, unshar the patch (sh PHNE_1056).

To install this patch do the following:
1) Run /etc/update (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/PHNE_1056.updt"
   (this assumes that you are in the /tmp directory where PHNE_1056.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/PHNE_1056/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHNE_1056.text file to /system/PHNE_1056 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=PHNE_1056.updt of=/dev/rmt/0m bs=2048