Discriminatory MTU fragmentation in a logical partition

A program product for discriminatory data transmission fragmentation, the computer program product comprising:

• a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code configured to
• receive an address of a destination and data to be transmitted to the destination, wherein the data to be transmitted is generated by an application on a first logical partition on a first computer system;
• determine a range of addresses that may be assigned to logical partitions on the first computer system;
• determine that the destination address is assigned to a second logical partition on the first computer system based on the destination address falling within the range of addresses;
• transmit the data to the second logical partition without fragmenting responsive to an executing instance of the computer readable program code determining that the destination address is assigned to the second logical partition on the first computer system;
• receive a second address of a second destination and second data to be transmitted to the second destination, wherein the second data to be transmitted is generated by the application on the first logical partition on the first computer system;
• determine that the second destination address is outside the determined range of addresses;
• determine an inter-system maximum transmission unit associated with a communication protocol, wherein the second data is to be transmitted to the second destination in accordance with the communication protocol;
• fragment the second data into a plurality of data blocks based, at least in part, on the inter-system maximum transmission unit;
• encapsulate each of the plurality of data blocks in accordance with the communication protocol to generate a plurality of encapsulated blocks;
• transmit the plurality of encapsulated blocks to a hypervisor of the first computer system, wherein the computer readable program code comprises hypervisor program code;
• the hypervisor program code configured to determine that each of the plurality of encapsulated blocks does not indicate that the encapsulated block is being transmitted between logical partitions of the first computer system;
• and
• transmit the plurality of encapsulated blocks to a virtual input/output server of the first computing system, wherein the virtual input/output server, via a shared Ethernet adapter, transmits each of the plurality of encapsulated blocks to the second destination, wherein the second destination comprises one of a logical partition on a second computer system, and a second computer system.