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os/bluestore: cap rocksdb cache size #15786
This PR introduces a new bluestore tunable to limit the amount of cache assigned to rocksdb. This, combined with a high bluestore_cache_kv_ratio, allows us to favor rocksdb's cache at very low cache values but favor bluestore's onode cache at high cache values. This improves 4k random write performance when cache values are low.