WAR overlapping

Signed-off-by: Enwei Zhu <21126786+syuoni@users.noreply.github.com>

Author: syuoni

cpp/tensorrt_llm/kernels/trtllmGenKernels/blockScaleMoe/RoutingDeepSeek.cu

@@ -647,7 +647,9 @@ void run(Data& data, void* stream)
     //
     // The upper bound is a strict requirement. The number of blocks should be determined by querying
     // the device properties, or conservatively low.
-    static int const numBlocksCoop = tensorrt_llm::common::getMultiProcessorCount();
+    static int const smCount = tensorrt_llm::common::getMultiProcessorCount();
+    // WAR: Reserve 8 SMs for overlapping kernels.
+    int const numBlocksCoop = smCount - 8;
 
     // Maximum number of tokens supported by the kernel using a cooperative launch.
     int const maxTokensCoop = (numBlocksCoop * numThreadsHist * 64) / data.mTopK;