Why is librbd1 / librados2 from Firefly 20% slower than the one from dumpling?

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Hi,

while testint firefly i cam into the sitation where i had a client where the latest dumpling packages where installed (0.67.9).

As my pool has hashppool false and the tunables are set to default it can talk to my firefly ceph sotrage.

For random 4k writes using fio with librbd and 32 jobs and an iodepth of 32.

I get these results:

librbd / librados2 from dumpling:
  write: io=3020.9MB, bw=103083KB/s, iops=25770, runt= 30008msec
WRITE: io=3020.9MB, aggrb=103082KB/s, minb=103082KB/s, maxb=103082KB/s, mint=30008msec, maxt=30008msec

librbd / librados2 from firefly:
  write: io=7344.3MB, bw=83537KB/s, iops=20884, runt= 90026msec
WRITE: io=7344.3MB, aggrb=83537KB/s, minb=83537KB/s, maxb=83537KB/s, mint=90026msec, maxt=90026msec

Stefan
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