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[quant] Ignore FP8 quantization layers (#20340)

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Co-authored-by: qiuxuan.lzw <qiuxuan.lzw@alibaba-inc.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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StonyPort
2026-03-13 13:59:39 +08:00
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docs/references/environment_variables.md
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@@ -126,7 +126,8 @@ SGLang supports various environment variables that can be used to configure its
| `SGLANG_NVFP4_CKPT_FP8_NEXTN_MOE` | Quantize moe of nextn layer from BF16 to FP8 when launching DeepSeek NVFP4 checkpoint | `false` |
| `SGLANG_ENABLE_FLASHINFER_FP8_GEMM` (deprecated) | Use flashinfer kernels when running blockwise fp8 GEMM on Blackwell GPUs. **DEPRECATED**: Please use `--fp8-gemm-backend=flashinfer_trtllm` (SM100/SM103) or `--fp8-gemm-backend=flashinfer_cutlass` (SM120/SM121 and newer) instead. | `false` |
| `SGLANG_SUPPORT_CUTLASS_BLOCK_FP8` (deprecated) | Use Cutlass kernels when running blockwise fp8 GEMM on Hopper or Blackwell GPUs. **DEPRECATED**: Please use `--fp8-gemm-backend=cutlass` instead. | `false` |
| `SGLANG_QUANT_ALLOW_DOWNCASTING` | Allow weights downcasting | `false` |
| `SGLANG_QUANT_ALLOW_DOWNCASTING` | Allow weight dtype downcasting during loading (e.g., fp32 → fp16). By default, SGLang rejects this kind of downcasting when using quantization. | `false` |
| `SGLANG_FP8_IGNORED_LAYERS` | A comma-separated list of layer names to ignore during FP8 quantization. For example: `model.layers.0,model.layers.1.,qkv_proj`. | `""` |
## Distributed Computing