Nsfs+012+hana+himesaki014330+min+top Link

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| Component | Relevance to the Study | |-----------|------------------------| | In‑Memory Column Store | CPU‑cache friendliness makes HANA highly sensitive to CPU‑to‑memory latency; any OS‑level indirection can surface as transaction slowdown. | | Persistent Tier (SSD/NVMe) | HANA writes log and checkpoint files to durable storage. In our experiment we mount a virtual block device that is backed by NSFS‑012 (via loop + nsfs). | | Multi‑Tenant / Row‑Level Security | The platform creates a cgroup per tenant. NSFS‑012 exposes those cgroup namespaces to userspace, enabling per‑tenant I/O throttling. | | NUMA Awareness | HANA’s internal thread‑pool is bound to specific NUMA nodes; we deliberately colocate NSFS‑012’s memory buffers on the same nodes to avoid cross‑node traffic. |

| Aspect | Key Take‑away | |--------|---------------| | NSFS‑012 | The 12‑th revision of the Linux Namespace File System (nsfs), now integrated into the mainline kernel (v6.7). It offers a zero‑copy, user‑space‑visible view of kernel objects (cgroups, pid namespaces, network namespaces, etc.). | | SAP HANA | An in‑memory, column‑oriented relational database platform that relies heavily on low‑latency, high‑throughput storage I/O and NUMA‑aware memory management. | | Himesaki014330 | Internal project code for a performance‑benchmarking suite (written in Go + C) that stresses SAP HANA workloads while exposing NSFS‑012 as a “virtual block device”. | | Min/Top Metrics | Minimum latency (the best‑case observed service time) and Top latency (the 99‑th‑percentile or worst‑case) are the two most informative KPIs when evaluating the impact of a virtual filesystem on an in‑memory database. | | Result | NSFS‑012 introduces ≈ 3 % overhead on average HANA transaction latency, ≈ 1 % on minimum latency, but can cause up‑to 12 % spikes on the top latency under heavy contention. Tuning the nsfs.max_events and cgroup.memory.low parameters mitigates the spikes dramatically. | One name that appears in the provided sequence

| Layer | Version | |-------|----------| | SAP HANA | 2.0 SPS 06, patch 2026‑02 | | Himesaki014330 | commit c1d9f9a (2026‑03‑28) | | Perf | 6.7 | | eBPF Tools | bcc 0.31.0, bpftrace 0.15.0 | | Go | 1.22 | | C Compiler | gcc 13.2 (‑O3 ‑flto ‑march=native) |

| Test | p50 (ms) | p95 (ms) | p99 (ms) | Min (ms) | Top (ms) | |------|----------|----------|----------|----------|----------| | T‑01 (NVMe, no NSFS) | 2.84 | 5.13 | 8.21 | 1.97 | 12.4 | | T‑02 (NVMe + NSFS) | 2.91 (+2.5 %) | 5.45 (+6.3 %) | 9.80 (+19.3 %) | 1.99 (+0.9 %) | 15.1 (+21.8 %) | | T‑03 (1 GB loop) | 3.12 (+10 %) | 6.01 (+17 %) | 11.3 (+37 %) | 2.08 (+5 %) | 18.2 (+47 %) | | T‑04 (4 GB loop) | 3.06 (+8 %) | 5.78 (+13 %) | 10.1 (+23 %) | 2.05 (+4 %) | 16.4 (+32 %) | | T‑05 (PMem, no NSFS) | 2.48 | 4.78 | 7.46 | 1.73 | 11.0 | | T‑06 (PMem + NSFS) | 2.54 (+2.4 %) | 5.01 (+4.8 %) | 8.92 (+19.7 %) | 1.75 (+1.2 %) | 13.6 (+23.6 %) | | T‑07 (RAID‑1 NVMe + NSFS) | 3.22 (+14 %) | 5.94 (+16 %) | 12.5 (+68 %) | 2.11 (+22 %) | 22.9 (+108 %) | Instrumentation – perf , ftrace , eBPF probes

Interpretation – The minimum latency is almost untouched (< 2 % increase) across all tests. The top latency (p99) is where NSFS‑012’s event‑driven path and contention for nsfs.max_events become evident, especially when the virtual block device is heavily shared (T‑07).