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docs: add LAN/WAN benchmark results table to README

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2026-07-05 21:11:33 +02:00
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@@ -142,3 +142,29 @@ The benchmark prints throughput metrics for the best configuration and speedup v
3. `sendfile()` bypasses userspace — ~2× faster on localhost for large files
4. Multithreading scales with core count
5. Metadata transfer adds negligible overhead when disabled, ~24 bytes per file when enabled
## Benchmark Results
50 MB of mixed file sizes over `localhost` with disk I/O throttled (reads ≤ 15 MB/s, writes ≤ 10 MB/s) and network emulation via `tc netem`. Each test was run 3×; the median is reported below.
### LAN (1000 Mbit, 20 ms ±1 ms, 0.1% loss)
| Configuration | Time | vs rsync (archive) | vs rsync (compress) |
|---|---|---|---|
| **Best: `-m -c`** | **0.20 s** | **11.2× faster** | **3.6× faster** |
| Compression (`-c`) | 0.31 s | 7.3× faster | 2.3× faster |
| Standard | 1.27 s | 1.8× faster | — |
| rsync (archive) | 2.27 s | — | — |
| rsync (archive + compress) | 0.72 s | — | — |
### WAN (100 Mbit, 50 ms ±10 ms, 1% loss)
| Configuration | Time | vs rsync (archive) | vs rsync (compress) |
|---|---|---|---|
| **Best: `-m -c`** | **0.39 s** | **44.8× faster** | **3.8× faster** |
| Compression (`-c`) | 0.64 s | 27.3× faster | 2.3× faster |
| Standard | 7.12 s | 2.4× faster | — |
| rsync (archive) | 17.44 s | — | — |
| rsync (archive + compress) | 1.47 s | — | — |
Compression reduces the data on the wire enough that the transfer becomes latency-bound rather than bandwidth-bound. On WAN, the best configuration runs 10.8× faster than the theoretical limit for uncompressed data, since zstd shrinks the 50 MB payload to a fraction of its original size over the wire.