[Qwen3-next] support mamba radix cache for overlap scheduler (#14792)

python/sglang/srt/managers/scheduler.py

@@ -405,7 +405,7 @@ class Scheduler(
 
         # Hybrid memory pool
         self.is_hybrid_swa = self.tp_worker.is_hybrid_swa
-        self.is_ssm_model = (
+        self.is_hybrid_ssm = (
             self.tp_worker.model_runner.hybrid_gdn_config is not None
             or self.tp_worker.model_runner.mamba2_config is not None
         )
@@ -772,6 +772,7 @@ class Scheduler(
             eviction_policy=server_args.radix_eviction_policy,
             enable_metrics=self.enable_metrics,
             enable_kv_cache_events=self.enable_kv_cache_events,
+            enable_mamba_extra_buffer=server_args.enable_mamba_extra_buffer(),
         )
 
         if (
@@ -808,7 +809,7 @@ class Scheduler(
                 self.tree_cache = SWARadixCache(
                     params=params, sliding_window_size=self.sliding_window_size
                 )
-            elif self.is_ssm_model:
+            elif self.is_hybrid_ssm:
                 from sglang.srt.mem_cache.mamba_radix_cache import MambaRadixCache
 
                 self.tree_cache = MambaRadixCache(params)