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MF60867 - LIC-COMM-TCPIP-UNPRED Application delays when using TCP/IP

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-COMM-TCPIP-UNPRED Application delays when using TCP/IP


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
TR   5770999  V7R2M0    MF99103   00/00    0000



NOTICE:
-------
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APAR Error Description / Circumvention

-----------------------------------------------
TCP large send packets (the data in the packet exceeds the
Maximum Segment Size (MSS)) sent over virtual Ethernet do not
reach their destination. This causes long delays or hangs in the
applications that are sending the data in the TCP packets.

CORRECTION FOR APAR MA45043 :
-----------------------------
This problem can only occur if a partition is migrated from a
system where TCP Large Send Offload (LSO) is not supported to a
system where LSO is supported. The fix is to not enable LSO
support for virtual Ethernet adapters when an partition is
migrated from a system that does not support LSO to a system
that does support LSO.

CIRCUMVENTION FOR APAR MA45043 :
--------------------------------
Vary off any line descriptions that use the affected virtual
Ethernet adapters, then vary the line descriptions on again.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R2M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA45043
Superseded by:......................View fix details for PTF MF99109
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C6127720


System i Support

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Document Information

Modified date:
13 November 2015