We are seeing degradation at 64k node/leaf sizes as well. So far the
degradation is most obvious with small writes. it affects XFS as
well, though not as severely. We are vigorously looking into it. :)
Just confirming that one of our clients has run fair amount (on
gigabytes scale) of mysql updates in preceding few days. So it appears
all performance degradation stems from random writes. Perhaps I will
rebuild each osd to check if it would help to recover.
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