feat: full NFSv4.2 server and client in pure Go

Assisted-by: GLM 5.3 Flash
2026-09-21 18:51:17 +02:00
commit a9b8039ef7
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+# Measurement: the wire level baseline
+
+- Date: 2026-09-22
+- Machine: AMD Ryzen AI Max+ Pro 395 (32 threads), idle
+- Toolchain: go1.27.1, no build flags
+- Command: `go test ./internal/nfs4server/ -run '^$' -bench=Wire -benchmem -count=5`
+
+## Baseline
+
+The commit 354760b, the head of development: the wire benchmarks are new, so this
+report is the baseline every later optimisation of the request path measures
+against. One benchmark iteration is one COMPOUND of the client library against
+the server handler over a loopback connection, sessions included.
+
+## Result
+
+Median of five runs, same session, same machine.
+
+| Benchmark | Throughput | Latency | Allocations |
+|---|---|---|---|
+| `BenchmarkWireRead64K` | 805 MB/s | 81.4 µs/op | 78 allocs, 628 KiB/op |
+| `BenchmarkWireWrite64K` | 1062 MB/s | 61.7 µs/op | 76 allocs, 428 KiB/op |
+| `BenchmarkWireGetattr` | - | 14.2 µs/op | 85 allocs, 4.1 KiB/op |
+| `BenchmarkWireLookup` | - | 15.0 µs/op | 81 allocs, 4.4 KiB/op |
+
+READ of a 64 KiB chunk is slower than WRITE of the same chunk, and the
+allocation columns show where the request path spends its memory: around 80
+allocations per COMPOUND regardless of the operation, on top of the data copies
+the read and write paths make. Both facts are the starting point for the
+optimisations of the request path; neither is a claim about any other setup.