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lab(drf-tlb): gather cost against distinct pages touched - #1774
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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
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…laim The skewed generator's within-page offsets shrank with P (8 -> 1), so the 512->1024 step was a cache-set artifact; it vanishes with balanced offsets. The rise past ~2048 pages survives. The original 1024 vs 65536 row gap also changed the distinct-line count (~1005 vs ~3970), so the earlier 'same footprint' statement is corrected and the TLB entry no longer claims to close that OPEN point. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
…led arm Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
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October 25, 2026 17:03
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…#1802 - PR_ARC_INVENTORY: compact entries for #1772, #1774–#1787, #1794–#1803, recorded from merge commits, changed files and each PR's own Status line. #1773 and #1793 are board-hygiene-only and get none. - INTEGRATION_PLANS: one index row for thirteen plans merged without one (D-NAM-1..5 + PZL, DT64-1..5 + QB pointer, D-ONNX-INTAKE-0). - LATEST_STATE: "main after #1803" section. - d-onnx-relalg-cap-v1: OP-ONNX-2 status cell names #1802's Burn onnx-ir vs Tract proposal; still OPEN. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
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Lab diagnostic (draft): how the focus gather build cost depends on distinct 4 KiB pages touched, at constant slots (4096) and constant distinct cache lines (4096 for P >= 512).
Result (reported, not gated)
x86-64-v3run agree.Not done: 2 MiB-page control, hardware counters (perf is unusable here), randomized visit order, decomposing the original gap into lines vs pages. "TLB" is the best-fitting reading, not a measured cause.
Files:
examples/tlb_probe.rs(both generators),entries/2026-10-25-drf-tlb-probe.md, correction onentries/2026-10-24-drf-p2-breakeven.md, STATUS_BOARD DRF-P2 row.Stays a draft diagnostic until the huge-page control is run or the claim is dropped.
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https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg