On 21 December 2015 at 22:07, Yan, Zheng <ukernel@xxxxxxxxx> wrote:
> OK, so i changed fio engine to 'sync' for the comparison of a single
> underlying osd vs the cephfs.
>
> the cephfs w/ sync is ~ 115iops / ~500KB/s.
This is normal because you were doing single thread sync IO. If
round-trip time for each OSD request is about 10ms (network latency),
you can only have about 100 IOPS.
yes... except the RTT is 200us. So that would be 5000 RTT/s.
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