It's a bug. search thread "Poor CentOS 7.5 client performance" in ceph-users.
On Tue, Aug 28, 2018 at 2:50 AM Marc Roos <[email protected]> wrote:
>
>
> I have a idle test cluster (centos7.5, Linux c04
> 3.10.0-862.9.1.el7.x86_64), and a client kernel mount cephfs.
>
> I tested reading a few files on this cephfs mount and get very low
> results compared to the rados bench. What could be the issue here?
>
> [@client folder]# dd if=5GB.img of=/dev/null status=progress
> 954585600 bytes (955 MB) copied, 157.455633 s, 6.1 MB/s
>
>
>
> I included this is rados bench that shows sort of that cluster
> performance is sort of as expected.
> [@c01 ~]# rados bench -p fs_data 10 write
> hints = 1
> Maintaining 16 concurrent writes of 4194304 bytes to objects of size
> 4194304 for up to 10 seconds or 0 objects
> Object prefix: benchmark_data_c01_453883
> sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg
> lat(s)
> 0 0 0 0 0 0 -
> 0
> 1 16 58 42 167.967 168 0.252071
> 0.323443
> 2 16 106 90 179.967 192 0.583383
> 0.324867
> 3 16 139 123 163.973 132 0.170865
> 0.325976
> 4 16 183 167 166.975 176 0.413676
> 0.361364
> 5 16 224 208 166.374 164 0.394369
> 0.365956
> 6 16 254 238 158.642 120 0.698396
> 0.382729
> 7 16 278 262 149.692 96 0.120742
> 0.397625
> 8 16 317 301 150.478 156 0.786822
> 0.411193
> 9 16 360 344 152.867 172 0.601956
> 0.411577
> 10 16 403 387 154.778 172 0.20342
> 0.404114
> Total time run: 10.353683
> Total writes made: 404
> Write size: 4194304
> Object size: 4194304
> Bandwidth (MB/sec): 156.08
> Stddev Bandwidth: 29.5778
> Max bandwidth (MB/sec): 192
> Min bandwidth (MB/sec): 96
> Average IOPS: 39
> Stddev IOPS: 7
> Max IOPS: 48
> Min IOPS: 24
> Average Latency(s): 0.409676
> Stddev Latency(s): 0.243565
> Max latency(s): 1.25028
> Min latency(s): 0.0830112
> Cleaning up (deleting benchmark objects)
> Removed 404 objects
> Clean up completed and total clean up time :0.867185
>
>
>
>
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