Hi,
While doing some benchmarks I have two identical Ceph clusters:
3x SuperMicro 1U
AMD Epyc 7302P 16C
256GB DDR
4x Samsung PM983 1,92TB
100Gbit networking
I tested on such a setup with v16.2.4 with fio:
bs=4k
qd=1
IOps: 695
That was very low as I was expecting at least >1000 IOps.
I checked with the second Ceph cluster which was still running v15.2.8,
the result: 1364 IOps.
I then upgraded from 15.2.8 to 15.2.13: 725 IOps
Looking at the differences between v15.2.8 and v15.2.8 of options.cc I
saw these options:
bluefs_buffered_io: false -> true
bluestore_cache_trim_max_skip_pinned: 1000 -> 64
The main difference seems to be 'bluefs_buffered_io', but in both cases
this was already explicitly set to 'true'.
So anything beyond 15.2.8 is right now giving me a much lower I/O
performance with Queue Depth = 1 and Block Size = 4k.
15.2.8: 1364 IOps
15.2.13: 725 IOps
16.2.4: 695 IOps
Has anybody else seen this as well? I'm trying to figure out where this
is going wrong.
Wido
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