Sun Java System Web Server 6.1 SP12 Performance Tuning, Sizing, and Scaling Guide

CacheEntries (CurrentCacheEntries / MaxCacheEntries)

The number of current cache entries and the maximum number of cache entries. A single cache entry represents a single IP address or DNS name lookup. The cache should be as large as the maximum number of clients that will access your web site concurrently. Note that setting the cache size too high will waste memory and degrade performance.

Tuning

You can set the maximum size of the DNS cache by: