On 21 December 2015 at 22:07, Yan, Zheng <uker...@gmail.com> 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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