diff --git a/src/observer/omt/ob_tenant.cpp b/src/observer/omt/ob_tenant.cpp
index 31191a8dc0..15d4c24ae5 100644
--- a/src/observer/omt/ob_tenant.cpp
+++ b/src/observer/omt/ob_tenant.cpp
@@ -1626,9 +1626,7 @@ void ObTenant::check_resource_manager_plan()
   ObResourceColMappingRuleManager &col_rule_mgr = G_RES_MGR.get_col_mapping_rule_mgr();
   char data[OB_MAX_RESOURCE_PLAN_NAME_LENGTH];
   ObDataBuffer allocator(data, OB_MAX_RESOURCE_PLAN_NAME_LENGTH);
-  if (!cgroup_ctrl_.is_valid()) {
-    // The cgroup is not initialized successfully, no need to refresh the resource manager plan
-  } else if (OB_SYS_TENANT_ID != id_ && OB_MAX_RESERVED_TENANT_ID >= id_) {
+  if (OB_SYS_TENANT_ID != id_ && OB_MAX_RESERVED_TENANT_ID >= id_) {
     // Except for system rental outside, internal tenants do not use resource plan for internal isolation
   } else if (OB_FAIL(ObSchemaUtils::get_tenant_varchar_variable(
               id_,
diff --git a/src/share/io/io_schedule/ob_io_mclock.cpp b/src/share/io/io_schedule/ob_io_mclock.cpp
index 413efa1b03..525d1548a5 100644
--- a/src/share/io/io_schedule/ob_io_mclock.cpp
+++ b/src/share/io/io_schedule/ob_io_mclock.cpp
@@ -42,7 +42,7 @@ int ObMClock::init(const int64_t min_iops, const int64_t max_iops, const int64_t
   if (OB_UNLIKELY(is_inited_)) {
     ret = OB_INIT_TWICE;
     LOG_WARN("init twice", K(ret), K(is_inited_));
-  } else if (OB_UNLIKELY(min_iops <= 0 || max_iops < min_iops || weight < 0)) {
+  } else if (OB_UNLIKELY(min_iops < 0 || max_iops < min_iops || weight < 0)) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("invalid argument", K(ret), K(min_iops), K(max_iops), K(weight));
   } else {
@@ -64,7 +64,7 @@ int ObMClock::update(const int64_t min_iops, const int64_t max_iops, const int64
   if (OB_UNLIKELY(!is_inited_)) {
     ret = OB_NOT_INIT;
     LOG_WARN("not init", K(ret), K(is_inited_));
-  } else if (OB_UNLIKELY(min_iops <= 0 || max_iops < min_iops || weight < 0)) {
+  } else if (OB_UNLIKELY(min_iops < 0 || max_iops < min_iops || weight < 0)) {
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("invalid argument", K(ret), K(min_iops), K(max_iops), K(weight));
   } else {
@@ -139,7 +139,7 @@ int ObMClock::dial_back_reservation_clock(const double iops_scale)
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("invalid argument", K(ret), K(iops_scale));
   } else {
-    const int64_t delta_ns = 1000L * 1000L * 1000L / (reservation_clock_.iops_ * iops_scale);
+    const int64_t delta_ns = reservation_clock_.iops_ == 0 ? 1000L * 1000L * 1000L / INT64_MAX : 1000L * 1000L * 1000L / (reservation_clock_.iops_ * iops_scale);
     ATOMIC_SAF(&reservation_clock_.last_ns_, delta_ns);
   }
   return ret;
diff --git a/src/share/scheduler/ob_dag_scheduler.cpp b/src/share/scheduler/ob_dag_scheduler.cpp
index c0ecdb6fa2..a0be8b8b48 100755
--- a/src/share/scheduler/ob_dag_scheduler.cpp
+++ b/src/share/scheduler/ob_dag_scheduler.cpp
@@ -1387,9 +1387,9 @@ void ObTenantDagWorker::resume()
 int ObTenantDagWorker::set_dag_resource(const uint64_t group_id)
 {
   int ret = OB_SUCCESS;
-  if (nullptr == GCTX.cgroup_ctrl_ || OB_UNLIKELY(!GCTX.cgroup_ctrl_->is_valid())) {
-    //invalid cgroup, cannot bind thread and control resource
-  } else  {
+  if (OB_ISNULL(GCTX.cgroup_ctrl_)) {
+    //cgroup not init, cannot bind thread and control resource
+  } else {
     uint64_t consumer_group_id = 0;
     if (group_id != 0) {
       //user level
@@ -1399,9 +1399,11 @@ int ObTenantDagWorker::set_dag_resource(const uint64_t group_id)
       LOG_WARN("fail to get group id by function", K(ret), K(MTL_ID()), K(function_type_), K(consumer_group_id));
     }
     if (OB_SUCC(ret) && consumer_group_id != group_id_) {
-      if (OB_FAIL(GCTX.cgroup_ctrl_->add_self_to_group(MTL_ID(), consumer_group_id))) {
+      // for CPU isolation, depend on cgroup
+      if (GCTX.cgroup_ctrl_->is_valid() && OB_FAIL(GCTX.cgroup_ctrl_->add_self_to_group(MTL_ID(), consumer_group_id))) {
         LOG_WARN("bind back thread to group failed", K(ret), K(GETTID()), K(MTL_ID()), K(group_id));
       } else {
+        // for IOPS isolation, only depend on consumer_group_id
         ATOMIC_SET(&group_id_, consumer_group_id);
         THIS_WORKER.set_group_id(static_cast<int32_t>(consumer_group_id));
       }