Communication device, method of controlling communication device, and information processing system

摘要

A host side extension device (130) includes a write data processing unit (134c), a mode setting unit (134b), and a second communication control unit (132). The write data processing unit (134c) executes a compression process on data to be transmitted to an I/O device and generates compressed data. The mode setting unit (134b) includes decompression control information to instruct the I/O side extension device not to execute a decompression process on the compressed data and compression control information to instruct the I/O device not to execute a compression process on data in a transmission notice notifying of that an own device is to transmit the compressed data to the I/O device through the I/O side extension device. The second communication control unit (132) transmits the transmission notice including the decompression control information and the compression control information to the I/O device through the I/O side extension device.