PR5: static YaRN factor-4 rope extension - #5
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August 31, 2026 07:06
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PR5: static YaRN factor-4 rope extension
Background
The native Qwen3.8 context is 262k; YaRN factor-4 extends the rope domain to ~1M positions so the model can be served far beyond native context.
Changes
--kv-capacitymay floor the device page pool below--max-context(the rope domain can exceed the pool; the cold pool recycles pages under pressure). Serve/CLI/engine validation relaxed accordingly.Files
src/core/device.h(yarn flag)src/serve/serve_options.cpp,apps/cli/options.cpp(--yarn)src/runtime/engine/kv_capacity.cpp(capacity floor relaxation)Dependency
Depends on PR1/PR2 (cold pool recycles pages under the relaxed pool). Merge after PR2 (order relative to PR3/PR4 is flexible).