Either install an OSA-Express Licensed Internal Code (LIC) level that supports optimized latency mode or remove the OLM parameter from the INTERFACE statement. Optimized latency mode is limited to OSA-Express3 ethernet features in QDIO mode running on an IBM® System z10™. Use the VTAM® DISPLAY TRL command to determine the OSA-Express LIC level that is currently installed. See the information about the DISPLAY TRL command in z/OS Communications Server: SNA Operation for more information. See the 2097DEVICE Preventive Service Planning (PSP) bucket and the 2098DEVICE Preventive Service Planning (PSP) bucket for the OSA-Express LIC levels required for optimized latency mode support.

See the information about the optimized latency mode in z/OS Communications Server: IP Configuration Guide for information about the networking affects of configuring with and without optimized latency mode.