Revisiting Ceph's Performance After 4 Years
summary
Benchmarks compare Ceph 14.2 → 18.2 on Ubuntu 22.04 using 4K single-thread, QD1 workloads (60s runs) on three 1U servers with 6 OSDs (25 Gb, jumbo frames, BGP L3), AMD EPYC Gen4 + NVMe. Latency drops from ~772 µs (2019) to ~672 µs baseline and up to ~40% lower in tuned runs; disabling OSD logging saves ~15 µs and aggregate IOPS roughly double. Bottlenecks are CPU wake/cstate and Ceph OSD code, not the network; the setup is built and produces repeatable results. 4K single-thread writes AMD EPYC Gen4 + NVMe latency down ~40%
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