IDS 9.40 Documentation (LRUs).

Hello. I've been trying to find some information about changes in the way IDS 9.40 handles LRU Queues. It seems that there is a new algorithm that allows a performance enhancement regarding Low and High Priority Buffers. The 9.40 documentation does not mention anything, but in a white paper it is described as an obvious advantage. It mentions the possibility to shift high priority buffers with low priority buffers based on the hit count. Can anyone give a light on this subject? Thanks RDT.