MattJackson
c427389f36
The halt-aware send loop polled try_send on a 50 ms sleep slice when the channel was full. That capped producer throughput at 1 / 50 ms = 20 frames/sec ≈ 1 MB/s at typical PES frame sizes — way below NFS, let alone local SSD/NVMe. Multi-day diagnostic 2026-05-13/14 surfaced it as the root cause of the 18 → 3 MB/s mux throughput regression on 0.21.x. Replaced std::sync::mpsc::sync_channel with crossbeam_channel::bounded and switched send_with_halt to send_timeout. Producer now BLOCKS on consumer drain (kernel-wakeup) instead of polling — the timeout slice (250 ms) only fires when the producer is waiting for stop signal observation, never on the happy path. Result: no throughput cap from this primitive at any medium speed. Mux is bounded by actual storage / network bandwidth, not by our channel implementation. Same fix needs to land in autorip's mux.rs producer-side sync_channel (separate sibling commit). Documented in (internal)/memory/ feedback_send_with_halt_poll_throttle.md.
51 lines
1.5 KiB
TOML
51 lines
1.5 KiB
TOML
[package]
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name = "libfreemkv"
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version = "0.21.6"
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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 project docs ("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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# Bounded MPSC channel with kernel-wakeup send_timeout. Used by `io::pipeline`
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# so the halt-aware send/finish loops can BLOCK on consumer drain instead of
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# polling — the 50 ms poll cadence of the previous mpsc-based impl capped mux
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# throughput at ~1 MB/s (see (internal)/memory/
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# feedback_send_with_halt_poll_throttle.md, 0.21.7).
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crossbeam-channel = "0.5"
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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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