I came accross this item on both the 2084 and 2094 PSP buckets: 06/12/13 The TCP Segmentation Off-load feature (also called OSA Large Send) is enabled by default if all of the requirements documented in PK02490 are met. Due to the potential for OSAs that are using this feature to experience unrecoverable INOPs(requiring intervention by configuring the affected CHPIDs off-line), it is currently recommended that Segmentation Off-load be disabled. To disable Segmentation Offload, it is recommended that the following maintenance be applied and then code NOSEGMENTATIONOFFLoad on the GLOBALCONFIG statement in the TCPIP PROFILE. FMID APAR PTF COMMENT HIP6160 PK21685 UK13788 TCP/IP JIP6169 PK21685 UK13789 TCP/IP (HFS) HIP6170 PK21685 UK13790 TCP/IP JIP6179 PK21685 UK13791 TCP/IP (HFS) HIP6180 PK26905 UK17180 TCP/IP JIP6189 PK26905 UK17181 TCP/IP (HFS) Once all of the microcode issues for Segmentation Offload are resolved, a Washington Systems Center Flash will be released advising what the minimum recommended code level will be. Flash 1232599 on the z/OS Communications Server Support web page will also be updated at that time; to subscribe to this (and other) updates, go to URL http://www.ibm.com/software/network/commserver/zos/support/
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