diff --git a/benchmarks/single_node/agentic/dsv4_fp4_b200_sglang_mtp.sh b/benchmarks/single_node/agentic/dsv4_fp4_b200_sglang_mtp.sh
index a740a88a0..27a52dc32 100755
--- a/benchmarks/single_node/agentic/dsv4_fp4_b200_sglang_mtp.sh
+++ b/benchmarks/single_node/agentic/dsv4_fp4_b200_sglang_mtp.sh
@@ -67,11 +67,15 @@ if require_agentic_kv_offload_backend hicache; then
     # DeepSeek V4 HiCache currently rejects --hicache-size and supports
     # capacity control only through a host/device token-capacity ratio.
     # DSv4 exposes capacity as a host/device token ratio rather than bytes.
-    # B200 ratio=8 stays below the configured host-memory capacity for the
-    # currently supported TP8 shape.
-    DEFAULT_HICACHE_RATIO=8
+    # DEP8 shards the host pools and fits ratio=8 on NScale. The replicated
+    # TP8 pools need a lower ratio: 2.75 allocates about 121 GiB per rank and
+    # leaves startup headroom on the 1.7 TiB NScale hosts.
+    DEFAULT_HICACHE_RATIO=2.75
+    if [ "$DP_ATTENTION" = "true" ]; then
+        DEFAULT_HICACHE_RATIO=8
+    fi
     HICACHE_RATIO="${HICACHE_RATIO:-$DEFAULT_HICACHE_RATIO}"
-    if [ "$HICACHE_RATIO" -gt "$DEFAULT_HICACHE_RATIO" ]; then
+    if awk -v ratio="$HICACHE_RATIO" -v max="$DEFAULT_HICACHE_RATIO" 'BEGIN { exit !(ratio > max) }'; then
         echo "Error: HICACHE_RATIO=$HICACHE_RATIO exceeds configured limit $DEFAULT_HICACHE_RATIO" >&2
         exit 1
     fi
@@ -93,6 +97,7 @@ SGLANG_BACKEND_PORT="$PORT"
 ROUTER_LOG="$RESULT_DIR/router.log"
 if [ "$DP_ATTENTION" = "true" ]; then
     USE_SGLANG_ROUTER=true
+    ROUTER_POLICY_ARGS=()
     export AIPERF_HTTP_X_SMG_ROUTING_KEY_FROM_CORRELATION_ID=true
     SGLANG_BACKEND_PORT=$((PORT + 1))
     SGLANG_ROUTER_METRICS_PORT=$((PORT + 10000))
@@ -103,15 +108,29 @@ PARALLEL_ARGS=(--tp "$TP")
 METRICS_ARGS=(--enable-metrics --enable-cache-report)
 CHUNKED_PREFILL_SIZE=8192
 SWA_FULL_TOKENS_RATIO=0.1
+MEM_FRACTION_STATIC=0.90
 if [ "$DP_ATTENTION" = "true" ]; then
     export SGLANG_OPT_DEEPGEMM_MEGA_MOE_USE_FP4_ACTS=1
     export SGLANG_OPT_DEEPGEMM_MEGA_MOE_USE_MXF4_KIND=1
     export SGLANG_OPT_DEEPGEMM_MEGA_MOE_NUM_MAX_TOKENS_PER_RANK=8320
+
+    # Leave HBM headroom for the FP4 indexer's context-dependent workspace.
+    MEM_FRACTION_STATIC=0.88
+    PREFILL_DECODE_INTERVAL=24
+
+    # Keep DP admission and session routing uniform across the DEP8 curve.
+    PARALLEL_ARGS+=(--load-balance-method total_requests)
+    METRICS_ARGS+=(--load-snapshot-publish-interval 1)
+    export AIPERF_HTTP_X_DYNAMO_SESSION_ID_FROM_CORRELATION_ID=true
+    if [ "$CONC" -eq 160 ]; then
+        PREFILL_DECODE_INTERVAL=20
+        ROUTER_POLICY_ARGS+=(--balance-abs-threshold 32)
+    fi
+
     PARALLEL_ARGS+=(
         --dp "$TP"
         --tokenizer-worker-num "$TP"
-        --enable-prefill-delayer
-        --prefill-decode-interval 10
+        --prefill-decode-interval "$PREFILL_DECODE_INTERVAL"
         --enable-dp-attention
         --enable-dp-attention-local-control-broadcast
         --incremental-streaming-output
@@ -123,9 +142,9 @@ if [ "$DP_ATTENTION" = "true" ]; then
         --disable-shared-experts-fusion
         --disable-flashinfer-autotune
     )
-    # SGLang divides this global budget by dp_size. Keep the tuned 8192-token
-    # per-rank budget for every DP-attention topology.
-    CHUNKED_PREFILL_SIZE=$((8192 * TP))
+    # SGLang divides this global budget by dp_size. Keep 6144 tokens per rank
+    # for every DP-attention profile so the FP4 indexer retains HBM headroom.
+    CHUNKED_PREFILL_SIZE=$((6144 * TP))
     SWA_FULL_TOKENS_RATIO=0.02
 else
     PARALLEL_ARGS+=(
@@ -138,14 +157,16 @@ fi
 # The B200-specialized image deadlocks immediately after weight loading when
 # forced through the B300 compressed-attention/page-size overrides.
 # DeepGEMM's DSv4 indexer needs a multi-GiB temporary allocation at long
-# contexts. Leave the same HBM headroom used by the B300 recipe so a nearly
-# full GPU KV cache does not OOM while HiCache is spilling to host memory.
-MEM_FRACTION_STATIC=0.88
+# contexts. The selected fractions preserve the measured indexer and CUDA
+# graph headroom while HiCache spills to host memory.
 
 # AgentX concurrency counts live session trees, not individual requests.
 # Allow subagent fan-out to exceed CONC without clipping request bursts.
 MAX_RUNNING_REQUESTS=$((2 * CONC))
 CUDA_GRAPH_MAX_BS=$((2 * CONC))
+if [ "$DP_ATTENTION" = "true" ]; then
+    CUDA_GRAPH_MAX_BS=32
+fi
 CUDA_GRAPH_ARGS=(--cuda-graph-max-bs "$CUDA_GRAPH_MAX_BS")
 
 export PYTHONNOUSERSITE=1
@@ -205,6 +226,7 @@ SGLANG_CMD=(
     # across local ranks so post-load weight repacking reads from page cache
     # instead of issuing redundant fragmented mmap faults from every rank.
     --weight-loader-prefetch-checkpoints
+    --model-loader-extra-config '{"enable_multithread_load": true}'
     "${METRICS_ARGS[@]}"
     "${CACHE_ARGS[@]}"
 )
@@ -241,7 +263,8 @@ if [ "$USE_SGLANG_ROUTER" = "true" ]; then
     echo "Starting SGLang router on port $PORT for $TP DP ranks..."
     "${SGLANG_ROUTER_CMD[@]}" \
         --worker-urls "http://localhost:$SGLANG_BACKEND_PORT" \
-        --policy consistent_hashing \
+        --policy cache_aware \
+        "${ROUTER_POLICY_ARGS[@]}" \
         --request-id-headers x-correlation-id \
         --dp-aware \
         --host 0.0.0.0 \
diff --git a/configs/nvidia-master.yaml b/configs/nvidia-master.yaml
index 438a3e9da..e37e33533 100644
--- a/configs/nvidia-master.yaml
+++ b/configs/nvidia-master.yaml
@@ -929,7 +929,7 @@ dsv4-fp4-b200-sglang:
       - { tp: 8, ep: 8, dp-attn: true, conc-start: 256, conc-end: 1024 }
 
 dsv4-fp4-b200-sglang-agentic-hicache-mtp:
-  image: lmsysorg/sglang:dev-nightly-0820
+  image: lmsysorg/sglang:nightly-dev-20260827-20621aa1
   model: deepseek-ai/DeepSeek-V4-Pro
   model-prefix: dsv4
   runner: cluster:b200-nscale
@@ -941,8 +941,8 @@ dsv4-fp4-b200-sglang-agentic-hicache-mtp:
     - dram-utilization: 0.80
       search-space:
       - { tp: 8, kv-offloading: none, spec-decoding: mtp, conc-list: [1, 2, 3, 4, 5] }
-      - { tp: 8, kv-offloading: dram, kv-offload-backend: { name: hicache }, spec-decoding: mtp, conc-list: [8, 10, 16, 32] }
-      - { tp: 8, ep: 8, dp-attn: true, kv-offloading: dram, kv-offload-backend: { name: hicache }, spec-decoding: mtp, conc-list: [32, 64, 96], router: { name: sglang-router, version: "0.3.2" } }
+      - { tp: 8, kv-offloading: dram, kv-offload-backend: { name: hicache }, spec-decoding: mtp, conc-list: [8, 10, 16] }
+      - { tp: 8, ep: 8, dp-attn: true, kv-offloading: dram, kv-offload-backend: { name: hicache }, spec-decoding: mtp, conc-list: [64, 96, 128, 160], router: { name: sglang-router, version: "0.3.2" } }
 
 dsv4-fp4-b200-vllm:
   image: vllm/vllm-openai:v0.25.0
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index ab92e7921..b4149d359 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -6576,3 +6576,15 @@
     - "Recipes sourced from srt-slurm (recipes/trtllm/qwen3.5-fp4/inferencex/gb300/{mtp,stp})."
     - "Runner: launch_gb300-nv.sh bumped from NVIDIA/srt-slurm@v1.0.29 to v1.0.72 for the dynamo-trt+qwen3.5+fp4 path."
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2730
+
+- config-keys:
+    - dsv4-fp4-b200-sglang-agentic-hicache-mtp
+  scenario-type:
+    - agentic-coding
+  description:
+    - "Refresh the B200 SGLang AgentX curve with validated TP8/DP8/EP8 HiCache profiles at DP-attention concurrencies 64, 96, 128, and 160."
+    - "Use lmsysorg/sglang:nightly-dev-20260827-20621aa1 for the B200 SGLang AgentX sweep."
+    - "Scope cache-aware routing and --prefill-decode-interval to the DP-attention profiles: use interval 24 at concurrency 64, 96, and 128, and interval 20 at concurrency 160."
+    - "Use mem-fraction-static 0.88 for every DP-attention profile while retaining 0.90 for TP profiles. Full c96 and c128 sweeps at 0.90 exhausted HBM in the context-dependent FP4-indexer workspace; lowering the fraction adds about 3.57 GiB of headroom per GPU. Across every DP-attention profile, use a 49152-token global chunked-prefill budget, CUDA graph maximum batch size 32, total-requests DP balancing, one-second load snapshots, and correlation-ID session routing; set the cache-aware absolute balance threshold to 32 at concurrency 160."
+    - "Fit the HiCache tier to NScale host memory by using ratio 2.75 for replicated TP8 profiles and retaining ratio 8 for sharded DP8 profiles. Ratio 8 on TP8 requests about 351 GiB per rank and fails host-pool initialization on a 1.7 TiB NScale node; ratio 2.75 targets about 121 GiB per rank while leaving startup headroom."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2718