docs: recommend io_uring defaults and name unavailable builds - #62
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Callers were pairing SQPOLL/IOPOLL with ring count and reading a combined unsupported string. Start from one ring and read depth, and say whether the missing requirement is the crate feature, OS, or architecture.
tisonkun
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Sep 21, 2026
Integrate io_uring configuration guidance, shared benchmark defaults, and availability diagnostics from #62. The changes merge without conflicts with the lifecycle and I/O refactoring. Validation: cargo x check, cargo x test, cargo x lint, and Linux workspace checks with no default features and all features.
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Summary
IoEngineOptions::IoUringselections still fail withErrorKind::Unsupported; the I/O source now names the missing crate feature, OS, or architecture.IoUringOptions::default()(1 ring / 64 in-flight for read and write). Reproduce the old 4/256 topology by setting those knobs explicitly.read.max_in_flightequal to concurrent L2 gets, leave write/reclaim at library defaults, and treat SQPOLL/IOPOLL as independent advanced flags.Test plan
cargo x checkcargo x testcargo x lintcargo test --package cache2 --lib --no-default-featurescovers the missing-feature source string