Fwd: ceph threads and performance

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Hi all,

we have a 5 node ceph cluster with 44 OSDs
where all nodes also serve as virtualization hosts,
running about 22 virtual machines with all in all about 75 rbd s
(158 including snapshots).

We experience absurd slow i/o in the VMs and I suspect
our thread settings in ceph.conf to be one of the culprits.

Is there a rule of thumb how to get the proper setting?
What side effect will have a higher threads setting?
Higer cpu utilisation? higher memory impact?

TIA
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