[Dong1017]

Purpose

Backport of #9270 to release/v0.32.0 (mitigates #8805 on the release line).

Warn at calibrator-build time when a Cache-DiT config leaves the validated envelope: taylorseer_order above 2 (no validated window), or taylorseer_order == 2 with max_continuous_cached_steps above the validated window of 4 (localized dark artifact on 10 s Ref2VA videos, evidence in #8805). Document the validated cache window plus the Cache-DiT + DLO memory margin on 64 GB-class dies in the MiniMax-H3 recipe.

Test Plan

• pytest tests/diffusion/cache/test_cache_dit.py — the four new warning tests (order 2 with the window above the validated 4 warns; order 2 at the validated window stays silent; order 3 warns even at the validated window; order 1 stays silent). Assertions check a stable warning fragment via caplog.records.
• Recipe renders as Markdown; log-only behavior change.

Test Result

• H200 (SM90, vLLM 0.32.0 + diffusers 0.40.0 env, matching requirements/common.txt, this branch): taylorseer subset 6 passed (the four new tests plus existing matches).
• No numerical or latency impact: the warning is log-only, and the recipe is documentation.

🤖 Generated with Claude Code

[Dong1017]

@Gaohan123 — the main-branch PR (#9270) is merged; this is the corresponding release/v0.32.0 backport, kept in sync through both review rounds (same diff: the narrowed warning + recipe guidance; CI 6/6 green). Could you take it from here — review this backport, or let us know if the release line prefers picking it up through the batch cherry-pick route (like #9206/#9251), in which case we can close this one? Thanks.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-24T16:02:58.087719Z We couldn’t complete this review. Comment @codex review to try again.	1c5206d	Draft marked ready

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[vllm-omni-review-bot]

This PR appears to belong to: docs/design/module/cache_management.md, docs/design/module/diffusion/index.md.

Module owners: @david6666666 @Isotr0py @princepride

Routing: @david6666666 via module of the changed files, module named in the PR description, model owner; @Isotr0py via module of the changed files, module named in the PR description, CODEOWNERS; @princepride via module of the changed files, module named in the PR description

@Dong1017, please review your own changes and leave a short self-review comment describing what you checked. PRs without author self-review may not be assigned a reviewer.

Please take a look when you have a chance. If you would like an automated review, mention @vllm-omni-review-bot in a comment.

[vllm-omni-review-bot]

Omni ReviewBot triage note

Automated triage of commit 1c5206d2d1e8 produced:

• Priority: high. Prompt maintainer attention is suggested.

These are automated triage suggestions only — the final decision belongs to the maintainers.