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Split writeback into kernel cache and write pipeline settings #10

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Merged
thomasjm merged 4 commits into from
Nov 14, 2026
Merged

Split writeback into kernel cache and write pipeline settings #10

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92c3477
Split writeback into --writeback-cache (off) and --write-pipeline
thomasjm Nov 14, 2026
88cf2a4
Keep overlapping and O_APPEND pipelined writes in order
thomasjm Nov 14, 2026
809453c
Merge small sequential writes while the write pipeline is full
thomasjm Nov 14, 2026
8000bea
Stop the diod test harness hanging or racing for ports
thomasjm Nov 14, 2026
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5 changes: 3 additions & 2 deletions README.md
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Expand Up @@ -89,8 +89,9 @@ multiple clients write concurrently.
| `attr_ttl` | 60s | How long the kernel trusts a cached `getattr`. `0` = round-trip every stat. |
| `entry_ttl` | 60s | How long the kernel trusts a cached name→inode lookup. |
| `negative_ttl` | 5s | Cache "no such file" lookups (skip round-trips on `$PATH`/include probes). |
| `writeback` | on | Pipeline writes via the FUSE writeback cache instead of one round-trip per write. |
| `wb_depth` | 16 | Max in-flight `Twrite`s per open file when write-back is on. |
| `write_pipeline` | on | Acknowledge writes at once and send their `Twrite`s in the background instead of one round-trip per write. Overlapping writes stay in order; adjacent small writes are merged while the pipeline is full. |
| `wb_depth` | 16 | Max in-flight `Twrite`s per file when the write pipeline is on. |
| `writeback_cache` | off | Let the kernel buffer writes in its page cache. Faster for small writes, but only safe when nothing else writes to the export: the kernel then keeps its own file sizes, so a file grown from outside the mount reads back truncated while its inode is cached, even after invalidation. |
| `readdirplus` | off | Prefetch entry attrs on `readdir`. Off by default — usually net-negative. |

## Custom transports
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