Relaxed LRU (least recently used) cache replacement policy is a performance feature designed to reduce overhead in named caches where little or no buffer replacement is occurring.
Relaxed LRU replacement policy removes the cache linkage overhead required by caches maintained on an MRU/LRU (most recently used/least recently used) basis. Relaxed LRU replacement policy is meant to be used when both of the following conditions are true:
There is little or no replacement of buffers in the cache, and
The data is not updated or is updated rarely.
In addition to saving the overhead to maintain the MRU/LRU chain, relaxed LRU replacement policy can improve CPU performance on multiple-CPU servers.
See Chapter 9, “Configuring Data Caches,” in the System Administration Guide for information on configuring caches to use LRU cache replacement policy.
See Chapter 16, “Memory Use and Performance,” in the Performance and Tuning Guide for information on how to select caches where relaxed LRU replacement policy can improve performance.
