Hi,
We test sync iops with fio sync=1 for database workloads in VM,
the backend is librbd and ceph (all SSD setup).
The result is sad to me. we only get ~400 IOPS sync randwrite with iodepth=1
to iodepth=32.
But test in physical machine with fio ioengine=rbd sync=1, we can reache ~35K IOPS.
seems the qemu rbd is the bottleneck.
qemu version is 2.1.2 with rbd_aio_flush patched.
rbd cache is off, qemu cache=none.
So what's wrong with it? Is that normal? Could you give me some help?
Thanks very much.
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