PH61321: IMPROVE PERFORMANCE ON A SOCKET READ OPERATION THAT SUSPENDS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The read operation differs from the receive operation to allow
  for reading from a file.  The differences also extend to the
  TCPIP logic that suspends a unit of work.  The suspend logic for
  a socket receive is more effiecient than the suspend logic for a
  socket read operation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of the IBM Communications Server for z/OS 2.4, 2.5 *
  * and 3.1 IP:                                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Read operation on a socket that is suspended by TCPIP uses a *
  * less efficient function than a receive operation.  The read  *
  * operation should use the more efficient suspend operation    *
  * that is used by a receive operation.                         *
  * SEMERU21T/K                                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply PTF                                                    *
  ****************************************************************
  RESTART:
  ***************************************************************
  * FUNCTION AFFECTED: Communications Server TCP/IP             *
  *                    Physical File System                     *
  ***************************************************************
  * DESCRIPTION      : COLDCOMM                                 *
  ***************************************************************
  * TIMING           : Post-APPLY                               *
  ***************************************************************
  If you are running multiple TCP/IP stacks in an MVS image, for
  this PTF to be fully effective, all of the TCP/IP stacks must
  be stopped and restarted.  An IPL is not required.
  

Problem conclusion

• EZBPFRDW has been amended to enable a socket read operation to
  use the more efficient suspend function.
  

Temporary fix

Comments

APAR Information

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

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

  UI97092 UI97093 UI97094

Modules/Macros

• EZBPFRDW
  

Fix information

• Fixed component name

  TCP/IP MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R250 PSY UI97093

     UP24/06/27 P F406

• R240 PSY UI97092

     UP24/06/27 P F406

• R310 PSY UI97094

     UP24/06/27 P F406

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.