[Quantizaiton][Feature] Pluggable KV Cache Data Types by lcfenglinwan · Pull Request #52670 · vllm-project/vllm

lcfenglinwan · 2026-08-18T01:06:35Z

Purpose

This PR is the implementation of #51751

Test Plan

Test Result

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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.

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github-actions · 2026-08-18T01:06:44Z

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hmellor · 2026-08-18T15:12:20Z

not a config

Thanks for your comment. Do you think it's okay to place this content in the vllm\model_executor\layers\quantization_init_.py file?

They are utils for CacheConfig.cache_dtype so they belong in cache.py

mergify · 2026-08-22T04:25:28Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @lcfenglinwan.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

github-actions · 2026-09-16T04:06:15Z

✅ @lcfenglinwan, CI is now available for this PR.

/ci run starts upstream CI; /amd-ci run starts AMD CI only.
Your branch must contain every commit currently on its upstream target branch. Merge or rebase onto the latest target branch, then rerun the command. Append --allow-stale to a run command to test an outdated branch at your own risk.
/ci retry retries failed jobs in the CI build for the current PR head. If the current head has no CI build, it starts a new CI build for the current head containing only jobs that failed in the latest earlier CI build for this PR.
/amd-ci retry retries failed jobs in AMD CI for the current PR head. Use /amd-ci run when the current head has no AMD CI build.
/ci cancel cancels scheduled or running CI builds for this PR branch; /amd-ci cancel does the same for AMD CI only.

mergify · 2026-09-16T04:13:59Z

Hi @lcfenglinwan, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

github-actions · 2026-10-16T07:42:16Z

✅ Queued 2 failed job(s) for retry in Buildkite CI #95321.

lcfenglinwan · 2026-10-16T10:42:03Z

/ci retry

github-actions · 2026-10-16T10:42:21Z

✅ Queued 2 failed job(s) for retry in Buildkite CI #95321.

lcfenglinwan · 2026-10-16T13:40:19Z

/ci retry

github-actions · 2026-10-16T13:40:39Z

✅ Queued 2 failed job(s) for retry in Buildkite CI #95321.

lcfenglinwan · 2026-10-17T02:24:21Z

/ci retry

github-actions · 2026-10-17T02:24:41Z

✅ Queued 16 failed job(s) for retry in Buildkite CI #95321.

mergify · 2026-10-17T06:08:55Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @lcfenglinwan.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

mergify · 2026-10-18T11:57:48Z

Hi @lcfenglinwan, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

lcfenglinwan · 2026-10-18T12:30:14Z

/ci run

github-actions · 2026-10-18T12:30:40Z

✅ Triggered Buildkite CI #95707 for commit ff93b1811343.

ℹ️ This PR is 2 commits behind upstream main. Merged upstream main into this branch as ff93b1811343 before starting CI. Pull the branch before pushing more changes.

lcfenglinwan · 2026-10-18T15:23:03Z

/ci retry

github-actions · 2026-10-18T15:23:21Z

✅ Queued 6 failed job(s) for retry in Buildkite CI #95707.

Isotr0py · 2026-10-19T03:04:48Z

/ci retry

github-actions · 2026-10-19T03:06:01Z

✅ Triggered Buildkite CI #95791 for commit dae03175f6b4, running 5 failed step(s) from Buildkite CI #95707.

aoshen02 · 2026-10-20T02:25:15Z

pre-commit ci failed

lcfenglinwan requested review from AndreasKaratzas, LucasWilkinson, MatthewBonanni, ProExpertProg, WoosukKwon, heheda12345, hmellor, houseroad, ivanium, mgoin, pavanimajety, robertgshaw2-redhat, tlrmchlsmth, yewentao256, youkaichao and zyongye as code owners August 18, 2026 01:06

claude Bot reviewed Aug 18, 2026

View reviewed changes

mergify Bot added the quantization label Aug 18, 2026

lcfenglinwan mentioned this pull request Aug 18, 2026

[RFC]: Pluggable KV Cache Data Types #51751

Closed

1 task done

hmellor reviewed Aug 18, 2026

View reviewed changes

mergify Bot added the minimax label Aug 20, 2026

mergify Bot added the needs-rebase label Aug 22, 2026

lcfenglinwan force-pushed the kvquant branch from 8998993 to bffbdba Compare September 15, 2026 06:07

mergify Bot removed the needs-rebase label Sep 15, 2026

Isotr0py self-assigned this Sep 15, 2026

ZJY0516 added the ready ONLY add when PR is ready to merge/full CI is needed label Sep 16, 2026

lcfenglinwan added 5 commits October 18, 2026 19:46

pluggable kv quant dtype

f0e0c99

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

remove redundant is_quantized_kv_cache func

1977726

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

format code

eb55bce

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

fix testcase

7cb9c57

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

fix is_quantized_kv_cache import

e996bf5

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

format code

5f70793

Signed-off-by: lcfenglinwan <lcfenglin@qq.com>

Merge branch 'main' into kvquant

ff93b18

Merge branch 'main' into kvquant

dae0317

chaojun-zhang mentioned this pull request Oct 20, 2026

[Bugfix] Fix stale is_quantized_kv_cache import in Step5 sparse attention #62602

Closed

patrk mentioned this pull request Oct 20, 2026

[Bugfix][CPU] Reject unsupported --kv-cache-dtype at CPU attention backend selection #62665

Merged

6 tasks done

zkawfanx mentioned this pull request Oct 22, 2026

[Start here] Classify the pinned DSv4.1 timeline and prepare chronological backport batches zkawfanx/vllm#18

Open

3 of 5 tasks

zhangxinyuehfad mentioned this pull request Oct 25, 2026

[Misc] main2main 1023 vllm-project/vllm-ascend#19694

Merged

5 tasks

JartX mentioned this pull request Oct 26, 2026

[Bugfix] KVQuantMode: give CUSTOM its own value (it aliased OCTAVE_K3V4) #63691

Open

afierka-intel mentioned this pull request Oct 27, 2026

[Bugfix][XPU] Apply attn_sink in the DeepSeek-V4 sparse MLA Triton kernel afierka-intel/vllm#76

Closed

1 of 6 tasks

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lcfenglinwan commented Aug 18, 2026 •

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