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MF62284 - OSP-COMM-ELAN-PERFM 268C VIRTUAL ETHERNET TRUNCATES OUTGOING

PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-COMM-ELAN-PERFM 268C VIRTUAL ETHERNET TRUNCATES OUTGOING


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED           PTF/FIX  LEVEL

TYPE PROGRAM  RELEASE   NUMBER   MIN/MAX  OPTION
---- -------- --------- -------  -------  ------
TR   5770999  V7R2M0    MF99104   00/00    0000



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

-----------------------------------------------
TCP communications, using Virtual Ethernet(268C) has performance
problems, when
configured with Large Send Offload with jumbo frames(max frame
size=8996), while configured to use Quality of Service( QoS ).

Specifically, if QoS is enabled, outgoing frames greater than
2048 bytes may be truncated if sent through a 268C virtual
Ethernet resource.  There are no error statistics recorded when
this truncation occurs, so the easiest way to observe this
behavior is by doing a communications trace of some kind in the
receiver, possibly coupled with a TCP/IP LIC trace on the
sender.

CORRECTION FOR APAR MA45691 :
-----------------------------
Licensed internal code has been changed to ensure that Quality
of Service (QoS) does not cause 268C virtual Ethernet resources
to truncate outgoing frames.

CIRCUMVENTION FOR APAR MA45691 :
--------------------------------
None.


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 MA45691
Superseded by:...................... View fix details for PTF MF99109
Recompile........................... N
Library............................. QSYS
MRI Feature ........................ NONE
Cum Level........................... C6306720


System i Support

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Document information

More support for: i family

Software version: V7R2M0

Operating system(s): OS/400

Reference #: MF62284

Modified date: 21 July 2016