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[docs] correct NIXL hybrid SSM heterogeneous TP support #63036

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NickLucche merged 3 commits into from
Oct 26, 2026
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[docs] correct NIXL hybrid SSM heterogeneous TP support #63036

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docs: correct NIXL hybrid SSM heterogeneous TP support
hlin99 Oct 22, 2026
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Merge branch 'main' into ww44_PR_doc
hlin99 Oct 26, 2026
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Merge branch 'main' into ww44_PR_doc
NickLucche Oct 26, 2026
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4 changes: 2 additions & 2 deletions docs/features/nixl_connector_compatibility.md
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Expand Up @@ -52,7 +52,7 @@ th:not(:first-child) {
| Dense Transformers | ✅ | ✅<sup>1</sup> | ✅ | ✅<sup>2</sup> | ✅ | ✅ | 🟠<sup>3</sup> |
| MLA (e.g. DeepSeek-V2/V3) | ✅ | ✅<sup>1</sup> | 🟠<sup>4</sup> | ✅<sup>2</sup> | ✅ | ✅ | 🟠<sup>3</sup> |
| Sparse MLA (e.g. DeepSeek-V3.2) | ✅ | ✅<sup>1</sup> | 🟠<sup>4</sup> | ✅<sup>2</sup> | ✅ | ✅ | 🟠<sup>3</sup> |
| Hybrid SSM / Mamba | ✅ | ❔ | 🚧<sup>5</sup> | ❌ | ✅ | ✅ | ❌<sup>6</sup> |
| Hybrid SSM / Mamba | ✅ | ❔ | 🟠<sup>5</sup> | ❌ | ✅ | ✅ | ❌<sup>6</sup> |
| MoE | ✅ | ✅<sup>1</sup> | ✅ | ✅<sup>2</sup> | ✅ | ✅ | 🟠<sup>3</sup> |
| Multimodal | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ | ❔ |
| Encoder-Decoder | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ |
Expand All @@ -67,7 +67,7 @@ what may differ.

<sup>4</sup> MLA KV cache is replicated across TP workers, so heterogeneous TP works but there is no head-splitting. When P TP > D TP, only a single read is executed (redundant ranks are skipped). D TP > P TP also works.

<sup>5</sup> Hybrid SSM (Mamba) models require **homogeneous TP** (`P TP == D TP`). Heterogeneous TP is not yet supported for Mamba layers.
<sup>5</sup> Hybrid SSM/Mamba models (including GDN) support heterogeneous TP in both directions, provided one TP size is an integer multiple of the other.

<sup>6</sup> HMA (required by hybrid models) does not support different remote block sizes.

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