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vulkan: disable large mmv subgroups on older Nvidia GPUs #15717

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Merged
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Sep 1, 2025
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vulkan: disable large mmv subgroups on older Nvidia GPUs #15717

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2 changes: 1 addition & 1 deletion ggml/src/ggml-vulkan/ggml-vulkan.cpp
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Expand Up @@ -4662,7 +4662,7 @@ static vk_pipeline ggml_vk_get_dequantize_mul_mat_vec(ggml_backend_vk_context *

// heuristic to choose workgroup size
uint32_t dmmv_wg = DMMV_WG_SIZE_SUBGROUP;
if (ctx->device->vendor_id == VK_VENDOR_ID_NVIDIA || ctx->device->vendor_id == VK_VENDOR_ID_INTEL) {
if ((ctx->device->vendor_id == VK_VENDOR_ID_NVIDIA && ctx->device->architecture != vk_device_architecture::NVIDIA_PRE_TURING) || ctx->device->vendor_id == VK_VENDOR_ID_INTEL) {
// Prefer larger workgroups when M is small, to spread the work out more
// and keep more SMs busy.
// q6_k seems to prefer small workgroup size even for "medium" values of M.
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