Is there an negative relationship between storage utilization and ceph performance?

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Hi,
since a long time I'm looking for performance improvements for our
ceph-cluster.
The last expansion got better performance, because we add another node
(with 12 OSDs). The storage utilization was after that 60%.

Now we reach again 69% (the next nodes are waiting for installation) and
the performance drop! OK, we also change the ceph-version from 0.72.x to
firefly.
But I'm wonder if there an relationship between utilization an performance?!
The OSDs are xfs disks, but now i start to use ext4, because of the bad
fragmentation on a xfs-filesystem (yes, I use the mountoption
allocsize=4M allready).

Has anybody the same effect?

Udo

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