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Revert "[Perf] fuse q, k norm for Flux2Attention (#17241)"#17332

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revert-17241-optimize
Jan 19, 2026
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Revert "[Perf] fuse q, k norm for Flux2Attention (#17241)"#17332
BBuf merged 1 commit intomainfrom
revert-17241-optimize

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@BBuf BBuf commented Jan 19, 2026

Reverts #17241

First, not implementing a fallback when applying qk_norm will break the AMD diffusion CI. Second, the decision to use qknorm should be based on whether can_use_fused_inplace_qknorm returns true, rather than being applied directly. Third, converting non-contiguous q and k tensors directly to contiguous here is a performance-sensitive operation and should not be done. Even though this is dead code, it should not be written this way. Finally, a warmup should be add in performace test command.

Please refer to: #17305

And I will refactor diffusion qk_norm apply logic to make it easier to use in the future.

cc @mickqian @yhyang201 @zminglei

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@github-actions github-actions Bot added the diffusion SGLang Diffusion label Jan 19, 2026
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OK, I’ll pay attention.

@BBuf BBuf merged commit a3d9a21 into main Jan 19, 2026
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@BBuf BBuf deleted the revert-17241-optimize branch January 19, 2026 07:24
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zminglei commented Jan 19, 2026

I'm seeing the apply_qk_norm's impl has already checked can_use_fused_inplace_qknorm and has a fallback path. And the change had passed all CI tests IIRC at that time and no AMD CI test failure at the final commit so I thought it should be fine. But thanks for the suggestion, I'll also take a look at the attached PR here to learn.

DotSlash-A pushed a commit to DotSlash-A/sglang that referenced this pull request Jan 19, 2026
* fix(ci): recover from corrupted MMMU parquet cache (sgl-project#17256)

* [diffusion] feat: support default 4-step inference for Flux2-Klein distilled models (sgl-project#17225)

Signed-off-by: Lancer <maruixiang6688@gmail.com>

* Add runner utilization report workflow (sgl-project#17234)

* cli: support sglang version (sgl-project#17250)

* Use swa radix cache and memory pool for gpt-oss model (sgl-project#17261)

* [VLM][Reland] Refactor load_mm_data to improve performance (sgl-project#16152)

Co-authored-by: luoyuan.luo <luoyuan.luo@antgroup.com>

* [Tiny] Improve docs (sgl-project#17264)

* [diffusion] fix: set guidance_scale default to None (sgl-project#17182)

* Tiny fix comment typo (sgl-project#17287)

* [SPEC_V2] Enable cudagraph draft_extend for trtllm_mla_backend and Acclen Fix for DP under cudagraph mode (sgl-project#16974)

* Add kl test for swa radix cache (sgl-project#17281)

* fix: Handle multiple named chat templates in HuggingFace tokenizers (sgl-project#17236)

Signed-off-by: Xinyuan Tong <xinyuantong.cs@gmail.com>

* Move radix cache related tests (sgl-project#17295)

* [Refactor] Add `-fp4-gemm-backend` to replace `SGLANG_FLASHINFER_FP4_GEMM_BACKEND` (sgl-project#16534)

Co-authored-by: Vincent Zhong <207368749+vincentzed@users.noreply.github.com>

* [Bugfix] Fix PD accuracy when MTP is not configured on the prefill node (sgl-project#17212)

Co-authored-by: Shangming Cai <csmthu@gmail.com>

* [Diffusion] Apply jit qk_norm to flux1 (sgl-project#17296)

* [Refactor] Split out deepseek v2 weight loader function into mixin (sgl-project#16649)

* [NPU]Support GPT-OSS for NPU (sgl-project#14197)

* [jit-kernel] Add CuTe DSL GDN Decode Kernel (sgl-project#15631)

Co-authored-by: Jinyan Chen <jinyanc@nvidia.com>

* [GLM 4.7] Add RTX 6000 Pro aka sm120 (sgl-project#17235)

Co-authored-by: root <root@ubuntu-nvidia.localdomain>

* Update CODEOWNERS for multimodal_gen (sgl-project#17308)

Co-authored-by: Xiaoyu Zhang <35585791+BBuf@users.noreply.github.com>

* [Feature] overlap LoRA weight loading with compute (sgl-project#15512)

* [PD] Optimize MHA models pp util calculation logic (sgl-project#17306)

* [Minor] Correct sglang version when installing from source (sgl-project#17315)

* Use dsv3 optimized routing `fused_topk_deepseek` instead of `moe_fused_gate` (sgl-project#15347)

* [DeepSeek v3.2] Opt MTP decode cuda batch sizes and nsa implementation (sgl-project#16961)

* Update code sync scripts (sgl-project#17319)

* [Auto Sync] Update tokenizer_manager.py (20260119) (sgl-project#17317)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

* support new qwen3_coder_detector (sgl-project#16744)

Co-authored-by: liugaoji.lgj <liugaoji.lgj@alibaba-inc.com>

* Fix kernel selection in biased_grouped_topk_gpu (sgl-project#17325)

* KV Cache Events with Attention DP bug fix (sgl-project#16030) (sgl-project#16412)

* [Perf] fuse q, k norm for Flux2Attention (sgl-project#17241)

Co-authored-by: Minglei Zhu <zminglei@linkedin.com>

* [CI] Add partition to stage-b-test-large-1-gpu (11->12) (sgl-project#17245)

* fix(ci): rate limit and permission errors in trace publishing (sgl-project#17238)

* Revert "[Perf] fuse q, k norm for Flux2Attention (sgl-project#17241)" (sgl-project#17332)

* Migrate performance, accuracy, and quantization tests to CI registry (sgl-project#17177)

Co-authored-by: Kangyan-Zhou <zky314343421@gmail.com>

* Inclusion of nvfp4 blockscale in EPLB Rebalance (sgl-project#17158)

* [Refactor] Set `fp4-gemm-backend=auto` on SM100 and rename `fp4-gemm-backend` with `flashinfer_` prefix (sgl-project#17309)

* [Diffusion] Apply qknorm to flux2 and apply lightx2v rms_norm_one_pass kernel(without residual) (sgl-project#17305)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Fix v32 continue_final_message not work (sgl-project#16567)

* Evict swa kv cache during decoding (sgl-project#17220)

* [RadixTree][1/N Refactor]: Support unified match_prefix params (sgl-project#17142)

Co-authored-by: yizhang2077 <1109276519@qq.com>
Co-authored-by: pansicheng <sicheng.pan.chn@gmail.com>

* [AMD CI] Migrate and Add More Testcases (sgl-project#17116)

Co-authored-by: yctseng0211 <yctseng@amd.com>

* [AMD] CI - add partitions for stage-b-test-small-1-gpu-amd (sgl-project#17345)

* Restore deepseek_v2.py to main's code, except the utils

* Ran `pre-commit`

---------

Signed-off-by: Lancer <maruixiang6688@gmail.com>
Signed-off-by: Xinyuan Tong <xinyuantong.cs@gmail.com>
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Co-authored-by: Shangming Cai <csmthu@gmail.com>
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Co-authored-by: Kartik Ramesh <kartikx2000@gmail.com>
Co-authored-by: Minglei Zhu <mingleizhu1122@gmail.com>
Co-authored-by: Minglei Zhu <zminglei@linkedin.com>
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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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