matthew
1085eb1e39
Pass 1 sweep speed on a healthy disc previously dipped from ~15 MB/s to ~1 MB/s every ~30 s on a host with default Linux dirty-page settings. Empirical cause: the kernel's vm.dirty_ratio (~20% of RAM) lets hundreds of MB of dirty pages accumulate, then bursts a flush at 99% disk utilisation that blocks app writes for ~1 s. Confirmed on the BU40N test bed — dirty pages grew 112 → 563 MB between bursts; lowering vm.dirty_bytes to 64 MB at the host sysctl level eliminated the dips. Shipping the equivalent inside libfreemkv so users do not need to tune the host kernel. - New crate::io::Writer: drop-in File wrapper (impl Write + Seek). Wraps a per-platform WritebackPipeline that on Linux schedules sync_file_range(WRITE) + lagging sync_file_range(WAIT_AFTER) + posix_fadvise(DONTNEED) in 32 MB chunks, bounding dirty cache at ~64 MB. macOS and Windows ship a no-op stub. - Disc::sweep wraps its output File in Writer. Loop body unchanged. - Module is purpose-built so any large sequential output (patch, mux) can adopt the same wrapper as a one-line change later.
45 lines
1.1 KiB
TOML
45 lines
1.1 KiB
TOML
[package]
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name = "libfreemkv"
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version = "0.17.10"
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edition = "2024"
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rust-version = "1.86"
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license = "AGPL-3.0-only"
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description = "Open source raw disc access library for optical drives"
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repository = "https://github.com/freemkv/libfreemkv"
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keywords = ["bluray", "uhd", "optical", "scsi", "disc"]
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categories = ["hardware-support", "multimedia"]
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[dependencies]
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serde = { version = "1", features = ["derive"] }
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serde_json = "1"
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sha1 = "0.10"
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sha2 = "0.10"
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aes = "0.8"
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cbc = "0.1"
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flate2 = "1"
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num-bigint = "0.4"
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num-traits = "0.2"
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num-integer = "0.1"
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rand = "0.8"
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cmac = "0.7"
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zip = { version = "2", default-features = false, features = ["deflate"] }
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base64 = "0.22.1"
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# Trace-level instrumentation for Disc::copy + SgIoTransport::execute. Permitted
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# under CLAUDE.md ("Acceptable strings: debug/trace logging"). Consumers (autorip)
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# wire a tracing subscriber and pipe events into the JSONL debug log.
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tracing = "0.1"
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[target.'cfg(target_os = "linux")'.dependencies]
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libc = "0.2"
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[target.'cfg(target_os = "macos")'.dependencies]
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libc = "0.2"
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[dev-dependencies]
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tempfile = "3"
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[[bench]]
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name = "sgio_read"
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harness = false
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