Hi all, Here is my test result for single MDS with single fuse client. I read 100,000 different files which are all size of 64K. Fuse client is on the same machine of MDS. The MDS and fuse client log level are set to 0. The fuse client latency is about 20 times of MDS. Is it as expected? I found that each request on client will try to accquire a lock, even though it will release when IO happend. Is it caused the latency? ceph daemon <mds.asok> perf dump | jq '.mds' "request": 99990, "reply": 99990, "reply_latency": { "avgcount": 99990, "sum": 9.653804187, "avgtime": 9.6547e-05 } ceph daemon <client.asok> perf dump | jq '.mds' "reply": { "avgcount": 99990, "sum": 181.812120526, "avgtime": 0.001818303 } Marvin