diff --git a/tests/functional/grpo_dp_mooncake.sh b/tests/functional/grpo_dp_mooncake.sh
index b646f6c75a8..a5f6e3d0bd9 100755
--- a/tests/functional/grpo_dp_mooncake.sh
+++ b/tests/functional/grpo_dp_mooncake.sh
@@ -38,6 +38,8 @@ uv run coverage run -a --data-file=$PROJECT_ROOT/tests/.coverage --source=$PROJE
     data_plane.enabled=true \
     data_plane.impl=transfer_queue \
     data_plane.backend=mooncake_cpu \
+    data_plane.global_segment_size=4294967296 \
+    data_plane.local_buffer_size=1073741824 \
     $@ \
     2>&1 | tee $RUN_LOG