SPARSENESS
(xid % (SPARSENESS * ((struct cl_cache *) \
uc->uc_entries = calloc(size * SPARSENESS, sizeof (cache_ptr));
(xid % (SPARSENESS*((struct udp_cache *) \
uc->uc_entries = ALLOC(cache_ptr, size * SPARSENESS);
BZERO(uc->uc_entries, cache_ptr, size * SPARSENESS);
FREE((char *)uc->uc_entries, cache_ptr, size * SPARSENESS);