> Probably not related to CephFS. Try to compare the latency you are
> seeing to the op_r_latency reported by the OSDs.
>
> The fast_read option on the pool can also help a lot for this IO pattern.
Magic, that actually cut the read-latency in half - making it more
aligned with what to expect from the HW+network side:
N Min Max Median Avg Stddev
x 100 0.015687 0.221538 0.025253 0.03259606 0.028827849
25ms as a median, 32ms average is still on the high side,
but way, way better.
Thanks.
--
Jesper
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