[radosgw] increase avg get time after sharding

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Hi,
We have 2 clusters with copy of objects.
On one of them we splited all large buckets (largest 17mln objects) to
256 buckets each (shards) and we have added 3 extra servers (6->9).
Old bucket was created in ceph argonaut.
Now we have dumpling.
After this operation get avg time increased almost twice:
https://www.dropbox.com/s/lbrpk6ias6r4459/avg_get_time.PNG
I found that also increased 'get_initial_lat'
Sum of this parametr on all servers in cluster:
https://www.dropbox.com/s/l90a43vf9ivw639/get_initial_lat_sum.png

Do you have an idea what is the reason?
Where can I start to search?

-- 
Regards
Dominik
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