diff --git a/benchmarks/single_node/agentic/glm5.2_fp4_mi355x_sglang_mtp.sh b/benchmarks/single_node/agentic/glm5.2_fp4_mi355x_sglang_mtp.sh
index 11e40a70e..f4d318d2e 100644
--- a/benchmarks/single_node/agentic/glm5.2_fp4_mi355x_sglang_mtp.sh
+++ b/benchmarks/single_node/agentic/glm5.2_fp4_mi355x_sglang_mtp.sh
@@ -72,11 +72,10 @@ export SGLANG_OPT_USE_TOPK_V2=false
 #
 # Per-arm L2 ratio (sizing rationale below) applies to both backends unless
 # overridden via HICACHE_RATIO. TP arm (182.7 GB/rank device pool): the
-# agentic-coding corpus saturates any fixed DRAM pool at conc ≥ 10; ratio 1.5
-# (~2.9 TB pinned) is the safe default for cluster:mi355x-amds nodes (~3.0 TB
-# available DRAM per runners.yaml). ratio=2.5 (~4.8 TB) yields higher
-# throughput at conc 10-12 but exceeds physical DRAM on these nodes and must
-# be set via HICACHE_RATIO env-var override on nodes that can accommodate it.
+# agentic-coding corpus saturates any fixed DRAM pool at conc ≥ 10; ratio 1.0
+# (~453 GB pinned at TP4) is the default. Larger ratios trade DRAM headroom
+# for host-tier capacity and must be set via the HICACHE_RATIO env-var
+# override on nodes that can accommodate them.
 # The DP-attention arm (159.4 GB/rank) only runs at conc >= 32, where the host
 # tier just absorbs overflow - ratio 0.5 (~1.2 TB pinned, ~1.8 TB of load
 # headroom) at negligible hit-rate cost (ratio 1.5 OOMs the host mid-storm at
@@ -86,14 +85,11 @@ if agentic_kv_offload_enabled; then
     if [ "$DP_ATTENTION" = "true" ]; then
         HICACHE_RATIO="${HICACHE_RATIO:-0.5}"
     else
-        # ratio=1.5 (~2.9 TB pinned): safe default within the ~3.0 TB DRAM
-        # available on cluster:mi355x-amds nodes. Set HICACHE_RATIO=2.5 via
-        # env-var override for maximum throughput on nodes with >4 TB DRAM.
-        HICACHE_RATIO="${HICACHE_RATIO:-1.5}"
+        # ratio=1.0 (~113 GB/rank, ~453 GB pinned at TP4). Raise via the
+        # HICACHE_RATIO env-var override on nodes with more DRAM headroom.
+        HICACHE_RATIO="${HICACHE_RATIO:-1.0}"
     fi
-    # write_through_selective skips DRAM writes for non-reusable KV blocks,
-    # reducing host-bus traffic without affecting the cache hit rate.
-    HICACHE_WRITE_POLICY="${HICACHE_WRITE_POLICY:-write_through_selective}"
+    HICACHE_WRITE_POLICY="${HICACHE_WRITE_POLICY:-write_through}"
     HICACHE_IO_BACKEND="${HICACHE_IO_BACKEND:-direct}"
     HICACHE_MEM_LAYOUT="${HICACHE_MEM_LAYOUT:-page_first_direct}"
     case "$KV_OFFLOAD_BACKEND" in
@@ -203,9 +199,11 @@ fi
 # than CONC sessions; headroom prevents scheduler stalls under burst.
 MAX_RUNNING_REQUESTS=$((2 * CONC))
 [ "$MAX_RUNNING_REQUESTS" -gt 256 ] && MAX_RUNNING_REQUESTS=256
-# SGLang interpolates a bs list [1..max_bs] automatically; cap at 64 to
-# keep graph-capture memory bounded without giving up coverage.
-CUDA_GRAPH_MAX_BS=$(( MAX_RUNNING_REQUESTS < 64 ? MAX_RUNNING_REQUESTS : 64 ))
+# SGLang interpolates the decode bs list automatically; cap at 64 to keep
+# graph-capture memory bounded without giving up coverage.
+# --cuda-graph-max-bs was a deprecated alias for the decode setting only.
+# The 20260910 image removed that alias, making its old spelling ambiguous.
+CUDA_GRAPH_MAX_BS_DECODE=$(( MAX_RUNNING_REQUESTS < 64 ? MAX_RUNNING_REQUESTS : 64 ))
 
 if [ "${EVAL_ONLY:-false}" != "true" ]; then
     export SGLANG_SIMULATE_ACC_LEN=3.61
@@ -222,8 +220,8 @@ SGLANG_CMD=(
     --trust-remote-code
     "${PARALLEL_ARGS[@]}"
     --kv-cache-dtype fp8_e4m3
-    --dsa-prefill-backend tilelang
-    --dsa-decode-backend tilelang
+    --dsa-prefill-backend triton
+    --dsa-decode-backend triton
     # GLM-5.2 emits the GLM-4.7-style tool-call format; glm47 is required for
     # structured message.tool_calls (SWE-bench agentic evals die without it).
     # The glm45 reasoning parser keeps hybrid thinking in reasoning_content.
@@ -232,7 +230,7 @@ SGLANG_CMD=(
     --chunked-prefill-size "$CHUNKED_PREFILL_SIZE"
     --mem-fraction-static "$MEM_FRACTION_STATIC"
     --max-running-requests "$MAX_RUNNING_REQUESTS"
-    --cuda-graph-max-bs "$CUDA_GRAPH_MAX_BS"
+    --cuda-graph-max-bs-decode "$CUDA_GRAPH_MAX_BS_DECODE"
     --speculative-algorithm EAGLE
     --speculative-num-steps 5
     --speculative-eagle-topk 1
diff --git a/configs/amd-master.yaml b/configs/amd-master.yaml
index 3d9a3dcca..54c789ba5 100644
--- a/configs/amd-master.yaml
+++ b/configs/amd-master.yaml
@@ -1704,7 +1704,7 @@ minimaxm3-fp4-mi355x-vllm-agentic-mtp:
 #     c6 and c8 removed after sweep validation: dominated by TP4/EP4 arm.
 # SA selects the Pareto-optimal arm per concurrency point.
 glm5.2-fp4-mi355x-sglang-agentic-mtp:
-  image: lmsysorg/sglang-rocm:v0.5.16-rocm720-mi35x-20260728
+  image: lmsysorg/sglang-rocm:v0.5.19-rocm720-mi35x-20260910
   model: amd/GLM-5.2-MXFP4
   model-prefix: glm5.2
   runner: cluster:mi355x-amds
diff --git a/perf-changelog.yaml b/perf-changelog.yaml
index 75b77afe1..1cc4df6fc 100644
--- a/perf-changelog.yaml
+++ b/perf-changelog.yaml
@@ -7428,3 +7428,16 @@
     - "Add representative AMD coverage for fixed-sequence request diagnostics and multinode concurrency filename processing; shared processor changes also affect unlisted fixed-sequence recipes."
     - "增加固定序列请求诊断与多节点并发文件名处理的代表性 AMD 覆盖；共享处理器变更也影响未列出的固定序列配置。"
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/3026
+
+- config-keys:
+    - glm5.2-fp4-mi355x-sglang-agentic-mtp
+  scenario-type:
+    - agentic-coding
+  description:
+    - "Update the SGLang ROCm image from lmsysorg/sglang-rocm:v0.5.16-rocm720-mi35x-20260728 to lmsysorg/sglang-rocm:v0.5.19-rocm720-mi35x-20260910."
+    - "Pick up our recent SGLang main-branch optimizations for GLM-5.2-MXFP4 serving."
+    - "Lower the TP HiCache host-pool ratio from 1.5 to 1.0 (DP-attention arm stays at 0.5). Eval and sweep still share the same ratio-based sizing; the smaller pool cuts pinned host DRAM on the TP4 arm (~453 GB vs ~679 GB). Keep the write policy at write_through: evals-only run 34569310922 passed with ratio 1.0 and write_through, so write_through_selective was unrelated to the earlier failure."
+    - "Remove the SGLANG_HEALTH_CHECK_TIMEOUT=120 override and its stale first-request JIT explanation; successful evals-only run 34569310922 used the default health-check timeout."
+    - "Replace the removed decode-only alias --cuda-graph-max-bs with its canonical name --cuda-graph-max-bs-decode, retaining the same min(2*CONC, 64) cap. The 20260910 image includes sgl-project/sglang#38375, so argparse interprets the removed spelling as an ambiguous prefix of the decode and prefill options and exits before serving. Leave --cuda-graph-max-bs-prefill unset: it controls a separate prefill token-capture ceiling, not request concurrency."
+    - "Switch DSA prefill and decode from tilelang to triton (sgl-project/sglang#30575 Fast Triton Sparse MLA). The 20260910 image already contains that backend; kv-cache-dtype stays fp8_e4m3, which the Triton DSA path requires."
+  pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/2900