The multi-queue replacement algorithm for second level uffer caches

This paper reports our research results that improve second level buffer cache performance. Several previous studies have shown that a good single leve cache replacement algorithm such as LRU does no work well with second level buffer caches. Second level buffer caches have different access pattern from first level buffer caches because Accesses to second level buffer caches are actually misses fro first leve buffer caches The paper presents our study of second level buffe cache access patterns using four large traces from various servers. We also introduce a new sec ond level buffer cache replacement algorithm called Multi-Queue (MQ). Our tracedriven simulation re sults show that MQ performs better than all seven tested alternatives. Our implementation on a rea storage system validates these results.