diff --git a/benchmarks/single_node/agentic/qwen3.5_fp4_mi355x_sglang_mtp.sh b/benchmarks/single_node/agentic/qwen3.5_fp4_mi355x_sglang_mtp.sh
index e9e3d5eb5..93ab281be 100644
--- a/benchmarks/single_node/agentic/qwen3.5_fp4_mi355x_sglang_mtp.sh
+++ b/benchmarks/single_node/agentic/qwen3.5_fp4_mi355x_sglang_mtp.sh
@@ -90,7 +90,10 @@ export SGLANG_USE_AITER=1
 export SGLANG_USE_AITER_UNIFIED_ATTN=1
 export AITER_FLYDSL_FORCE=1
 export SGLANG_MAMBA_SSM_DTYPE=bfloat16
-export ROCM_QUICK_REDUCE_QUANTIZATION=INT8
+# Fused AR+RMSNorm via AITER custom allreduce (replaces INT8 QuickReduce;
+# the two are mutually exclusive).  Measured +5.9% output throughput at
+# TP2/conc4 agentic workload vs the QuickReduce baseline.
+# export ROCM_QUICK_REDUCE_QUANTIZATION=INT8
 export SGLANG_TIMEOUT_KEEP_ALIVE=1800
 
 if [ "${EVAL_ONLY:-false}" != "true" ]; then
@@ -127,6 +130,7 @@ SGLANG_CMD=(
     --speculative-num-steps 3
     --speculative-eagle-topk 1
     --speculative-num-draft-tokens 4
+    --enable-aiter-allreduce-fusion
     --enable-metrics
     --enable-cache-report
     "${CACHE_ARGS[@]}"
diff --git a/configs/amd-master.yaml b/configs/amd-master.yaml
index 0d380154a..f97dd977b 100644
--- a/configs/amd-master.yaml
+++ b/configs/amd-master.yaml
@@ -372,10 +372,8 @@ qwen3.5-fp4-mi355x-sglang-agentic-mtp:
     agentic-coding:
     - dram-utilization: 0.80
       search-space:
-      - { tp: 4, ep: 1, spec-decoding: mtp, kv-offloading: none, conc-list: [1, 4, 8, 12, 16, 20, 24, 28, 32, 40] }
+      - { tp: 4, ep: 1, spec-decoding: mtp, kv-offloading: none, conc-list: [1, 4, 8, 12, 16, 20, 24, 28, 32] }
       - { tp: 2, ep: 1, spec-decoding: mtp, kv-offloading: none, conc-list: [1, 4, 8, 12, 16, 20] }
-      - { tp: 4, ep: 1, spec-decoding: mtp, kv-offloading: dram, kv-offload-backend: { name: hicache }, conc-list: [40, 48, 56, 64] }
-      - { tp: 2, ep: 1, spec-decoding: mtp, kv-offloading: dram, kv-offload-backend: { name: hicache }, conc-list: [20, 24, 28, 32] }
 
 qwen3.5-fp4-mi355x-sglang-disagg:
   image: lmsysorg/sglang-rocm:v0.5.12.post1-rocm720-mi35x-20260523
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index 4eb0a2caa..5ea858f85 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -6821,3 +6821,19 @@
   description:
     - "Refresh to collect TensorRT-LLM server metrics."
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2774
+
+- config-keys:
+    - qwen3.5-fp4-mi355x-sglang-agentic-mtp
+  scenario-type:
+    - agentic-coding
+  description:
+    - "Enable AITER fused allreduce+RMSNorm (--enable-aiter-allreduce-fusion), replacing INT8 QuickReduce. +5.9% output throughput per GPU at TP2/conc4 agentic workload (114.1 -> 120.8 tok/s). -20.1% decode cycle time from kernel-level profiling."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2801
+
+- config-keys:
+    - qwen3.5-fp4-mi355x-sglang-agentic-mtp
+  scenario-type:
+    - agentic-coding
+  description:
+    - "Trim concurrency sweep: remove hicache KV-offloading configs (TP4/TP2 dram), cap TP4 no-offload conc-list at 32 (was 40)."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2801