| 摘要 |
PROBLEM TO BE SOLVED: To increase efficiency in communication control processing. SOLUTION: In a communication controller 1, DMA(direct memory access) transfer is directly performed between a network I/O device 4 and a cache memory device 6 without interposing a main memory 8. Besides, a DMA 5 inside the network I/O device 4 is equipped with an attribute adding part 9 and a header 11 as data of high access probability from a CPU 3 in the data of a received packet is transferred after an attribute 14 of '1' is added to the header 11. Since the cache memory device 6 has a function for allocating only the data with the attribute bit of '1' to a cache part, a hit rate to access from a CPU 3 is remarkably improved. Thus, the occurrence of data exchange between the cache memory device 6 and the main memory 8 is decreased and processing efficiency in communication control is improved.
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