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The POWER5e system incorporates several features designed to improve performance by eliminating bottlenecks and accelerating common functions used in operating systems. This paper discusses how two of the supported operating systems for POWER5-AIXt and Linuxe-make use of these features to deliver improved system scalability and performance. In particular, the overheads for synchronizing translation-lookaside buffer (TLB) invalidations between processors, and for ensuring that the instructiondoi:10.1147/rd.494.0533 fatcat:okawyfaynndb3ip3cxvkfmw6ki