massive rbd speed decrease with latest git master

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Hello list,

while updating ceph to the latest master i noticed this:

Commit a01b112d71a0b6a1bb206d53867d13536d17bbf6:
rand. 4k WRITE: 3000 iop/s

Commit 72a710ac47355ae3ca1d055be1496c91956d549d:
rand. 4k WRITE: 900 iop/s

Same for rand 4k read - haven't tested sequential stuff.

Stefan
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