Update default max_num_batch_tokens for chunked prefill to 2048 (#10544)

vllm/config.py

@@ -1133,9 +1133,9 @@ class SchedulerConfig:
                     # max_num_batched_tokens.
                     self.max_num_batched_tokens = max(self.max_model_len, 2048)
                 else:
-                    # It is the values that have the best balance between ITL
-                    # and TTFT on A100. Note it is not optimized for throughput.
-                    self.max_num_batched_tokens = 512
+                    # This value is chosen to have a balance between ITL
+                    # and TTFT. Note it is not optimized for throughput.
+                    self.max_num_batched_tokens = 2048
             else:
                 # If max_model_len is too short, use 2048 as the default value
                 # for higher throughput.