PI10617: PROVIDE MECHANISM TO SET DEFAULT BUFFER SIZE FOR CHANNELS TO THENEW 2 MB DEFAULT AS IS NOW AVAILABLE UNDER Z/OS VERSION 2.1

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible in next release.

Error description

• Provide a mechanism to leverage the setting of default buffer
  sizes under z/OS 2.1 to a new 2 MB value via CHISERVP
  .
  Additional keywords:
  SETSOCKOPT send receive TCPSENDBFRSIZE TCPRCVBUFRSIZE
  TCP/IP TCPIP channel performance slow network latency
  QREP InfoSphere Replication Server
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: In z/OS V2.1 Comms Server there is a    *
  *                      new option to allow TCP/IP Send and     *
  *                      Receive buffers to be immediately set   *
  *                      to 2MB. There is no way to enable this  *
  *                      function for WebSphere MQ for z/OS      *
  *                      without enabling for all network        *
  *                      connections on the same TCP/IP stack.   *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  On higher latency network connections, there may be an
  improvement in network throughput by using larger TCP/IP Send
  and Receive buffers.
  
  Customers who wish to use larger TCP/IP send or receive buffers
  must currently do so by changing the stack-wide defaults in
  TCP/IP itself.
  
  This APAR provides a basic switch to allow MQ to use larger
  buffers without configuring them at the stack level.
  

Problem conclusion

Temporary fix

Comments

• Applying the PTF for this APAR will not enable this function. It
  should only be used under direction from IBM Support.
  
  Please contact IBM Support if you are interested in using this
  capability.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI15515

Modules/Macros

• CSQXCCIT CSQXCLIT
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UI15515

     UP14/04/08 P F404

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.