Enterprise Extender Best Practices › Enterprise Extender Management › VTAM CPU Optimization

VTAM CPU Optimization

If you have many EE connections kept indefinitely active, the following functions can reduce VTAM CPU use:

HPR alive timer optimization

This function is enabled by default and is controlled by the HPREELIV operand on the XCA major node.

LDLC Keep-Alive reduction

This function requires you to specify a maximum time value on the LIVTIME operand for the EE PORT statement.

Use CA NetMaster NM for TCP/IP to determine VTAM CPU use

1. From the command prompt, enter the following panel shortcut:

   /EEXCA
   

   The EE XCA Major Node Summary is displayed.

2. Press F4 (Display).

   The results of the command D EE,LIST=DETAIL are displayed in Command Entry.

3. Scroll down, and review the IST2004I message for each line group.

   LIVTIME=(default,max) is displayed.

   • A max value of 0 indicates that the time between TEST sends does not increase when the connection is idle. LDLC Keep-Alive reduction is not active.
   • A nonzero value for max indicates that the default time is doubled during idle periods until the max value is reached.
4. From the command prompt, enter the following panel shortcut:

   /EERTP
   

   The RTP pipes currently using an EE connection are listed.

5. Enter S next to a pipe.

   The RTP panel is displayed.

6. Check that the Liveness Timer field has a value of '0s'.