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[DSV4][CP] Write low-ratio page indices when CP prefill runs paged attention #43935

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Merged
Oasis-Git merged 2 commits into from
Oct 13, 2026
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[DSV4][CP] Write low-ratio page indices when CP prefill runs paged attention #43935

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[DSV4][CP] Write low-ratio page indices when CP prefill runs paged at…
YAMY1234 Oct 12, 2026
6295420
Drop the gate-agreement unit test
YAMY1234 Oct 12, 2026
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7 changes: 3 additions & 4 deletions python/sglang/srt/layers/attention/deepseek_v4_backend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3323,15 +3323,14 @@ def _make_low_ratio_prefill_indexer_inputs(

def _low_ratio_prefill_reads_page_indices(self, forward_batch: ForwardBatch):
# The negation of the sparse-prefill gate in forward(), which reads only
# raw_indices; the query-count clause is dropped, so this errs to True.
# raw_indices; num_qo_tokens=0 drops the query-count clause, so this errs
# to True. Paged attention under active CP needs the page indices.
return (
self.trtllm_attn
or not forward_batch.forward_mode.is_extend_without_speculative()
or get_platform().is_sm120
or self.tail_forward_metadata is not None
or self.forward_metadata.late_layer_tail is not None
or self.token_to_kv_pool.request_window is not None
or not envs.SGLANG_OPT_FLASHMLA_SPARSE_PREFILL.get()
or not self._use_sparse_prefill(forward_batch, num_qo_tokens=0)
)

def _publish_candidate_metadata(self, published: Optional[CandidateMetadata]):
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