REGISTER FILES FOR I/O PACKET COMPRESSION

Systems, apparatuses, and methods for reducing inter-node bandwidth are contemplated. A computer system includes requesting nodes sending transactions to target nodes. A requesting node sends a packet that includes a register identifier (ID) in place of a data value in the packet. The register ID indicates a register in the target node storing the data value. The register ID uses fewer bits in the packet than the data value. The data value may be a memory address referencing a memory location in the target node. The received packet may also include an opcode indicating an operation to perform on the targeted data value.