Hashed Cache Index mode is a new hardware feature available in UltraSPARC T2 processors. The hardware uses many more address bits to compute an L2 cache index. As a result, there are more page colors for large pages.
To achieve optimum performance, the Solaris kernel must maximize the number of page colors used by all the threads sharing a cache. The Solaris virtual memory subsystem has been extended to support this new hardware feature. Correct color calculation improves the performance and throughput consistency of application programs on UltraSPARC T2 systems.