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[v0.31.0 fixes] Cherry-pick mamba + prefix caching + mtp acceptance rate fix - #11

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@bxyu-nvidia bxyu-nvidia commented Oct 8, 2026 •

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PLEASE FILL IN THE PR DESCRIPTION HERE ENSURING ALL CHECKLIST ITEMS (AT THE BOTTOM) HAVE BEEN CONSIDERED.

Purpose

Cherry-picked the following PRs:

  1. [Bugfix][Spec Decode] Reuse saved Mamba prompt tails with MTP vllm-project/vllm#57180

Test Plan

Test Result


Essential Elements of an Effective PR Description Checklist
  • The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
  • The test plan, such as providing test command.
  • The test results, such as pasting the results comparison before and after, or e2e results
  • (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

BEFORE SUBMITTING, PLEASE READ https://docs.vllm.ai/en/latest/contributing (anything written below this line will be removed by GitHub Actions)

Preserve the saved prompt-tail checkpoint while retaining the EAGLE proof drop. Cover repeated and extended prompts, changed suffixes, and reusable-token bounds in both lookup paths.

Based on work by Brian Yu.

Assisted-by: Codex

Signed-off-by: natsala13 <natouda@gmail.com>
(cherry picked from commit 4ae5337)

Signed-off-by: Brian Yu <bxyu@nvidia.com>
Update the newer retention regression to require the recovered 96-token hit, while preserving its checks that both retained Mamba states exist.

Assisted-by: Codex

Signed-off-by: natsala13 <natouda@gmail.com>
(cherry picked from commit c6a1b11)
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@bxyu-nvidia bxyu-nvidia changed the title Bxyu/v0.31.0 fixes [v0.31.0 fixes] Cherry-pick mamba + prefix caching + mtp acceptance rate fix Oct 9, 2026
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bxyu-nvidia added this pull request to stack #18 October 16, 2026 03:00
@bxyu-nvidia
bxyu-nvidia removed this pull request from stack #18 October 16, 2026 03:00
@bxyu-nvidia
bxyu-nvidia added this pull request to stack #19 October 16, 2026 03:02
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