关键词: 异或 链描述符 应用加速单元

Abstract:

To improve the reliability of RAID storage systems,the XOR operation is performed to generate the parity check information in RAID level 3/5/6 when wr iting IO data,and is also used to rebuild an RAID system when the system works in the degrade mode.So the XOR operation is one of the most frequent and  important operations for RAID systems.In this paper,it discusses the theory and implementation of hardware and software for the application acceleratorunit in the Intel IOP321 processor,then proves by experiments that the XOR speed of the special hardware unit is 7 times faster at least than that of em bedded CPUs,which can resolve the bottleneck problem of the XOR operation in embedded environments.

Key words: XOR;chain descriptor;AAU