You adjusted osd_memory_target?  Higher than the default 4GB?

> 
> 
> Another thing that we've found is that rocksdb can become quite slow if it 
> doesn't have enough memory for internal caches. As our cluster usage has 
> grown, we've needed to increase OSD memory in accordance with bucket index 
> pool usage. One one cluster, we found that increasing OSD memory improved 
> rocksdb latencies by over 10x.

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