half performace with keyvalue backend in 0.87

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Dear Ceph,
      I used keyvalue backend in 0.80.6 and 0.80.7, the average speed with rsync millions small files is 10M byte /second
when i upgrade to 0.87(giant), the speed slow down to 5M byte /second,  I don't why , is there any tunning option for this?
will superblock cause those performance slow down?



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