[CPU] Support head sizes 80 and 112 with vec16 fallback#251
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Meghagaur
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/build-konflux |
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Hi @wznoinsk |
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moulalis
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Jan 15, 2026
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Purpose
Reintroduce support for head dimensions 80 and 112 in CPU attention backend which were previously removed in vllm-project/vllm#27954 but these head dimensions are commonly used by granite models deployed on Z archs. Since these heads are not friendly for Intel AMX instruction set. The implementation now falls back to vec16.
Test Plan
Build Docker image and test using ibm-granite/granite-3b-code-base-2k model which has head size of 80.
upstream PR - vllm-project/vllm#31968