perf: confirm MI300X NIXL C8 in the full AgentX curve

Author: cquil11

inferencex-e2e/benchmarks/multi_node/srt-slurm-recipes/dsv41flash/vllm/mi300x-fp4/agentx/disagg-variants.yaml

@@ -93,6 +93,11 @@ base:
 
 override_cpu_engram_c4: {}
 
+override_cpu_engram_c8:
+  benchmark:
+    env:
+      CONC: "8"
+
 override_cpu_engram_c16:
   benchmark:
     env:

inferencex-e2e/configs/amd-master.yaml

@@ -1067,6 +1067,17 @@ dsv41flash-fp4-mi300x-vllm-agentic-nixl:
           additional-settings:
           - CONFIG_FILE=recipes/dsv41flash/vllm/mi300x-fp4/agentx/disagg-variants.yaml:override_cpu_engram_c4
         decode: {num-worker: 1, tp: 4, ep: 1, dp-attn: false}
+      - spec-decoding: mtp
+        kv-offloading: none
+        conc-list: [8]
+        prefill:
+          num-worker: 1
+          tp: 4
+          ep: 1
+          dp-attn: false
+          additional-settings:
+          - CONFIG_FILE=recipes/dsv41flash/vllm/mi300x-fp4/agentx/disagg-variants.yaml:override_cpu_engram_c8
+        decode: {num-worker: 1, tp: 4, ep: 1, dp-attn: false}
       - spec-decoding: mtp
         kv-offloading: none
         conc-list: [16]