diff --git a/cdc/processor/sinkmanager/manager.go b/cdc/processor/sinkmanager/manager.go
index 49528e7fc3b..694b248a7ce 100644
--- a/cdc/processor/sinkmanager/manager.go
+++ b/cdc/processor/sinkmanager/manager.go
@@ -164,15 +164,13 @@ func New(
 		m.redoTaskChan = make(chan *redoTask)
 		m.redoWorkerAvailable = make(chan struct{}, 1)
 
-		if changefeedInfo.Config.Consistent.EnableEventCache {
-			// Use 3/4 memory quota as redo quota, and 1/2 again for redo cache.
-			m.sinkMemQuota = memquota.NewMemQuota(changefeedID, changefeedInfo.Config.MemoryQuota/4*1, "sink")
-			redoQuota := changefeedInfo.Config.MemoryQuota / 4 * 3
-			m.redoMemQuota = memquota.NewMemQuota(changefeedID, redoQuota, "redo")
-			m.eventCache = newRedoEventCache(changefeedID, redoQuota/2*1)
-		} else {
-			m.sinkMemQuota = memquota.NewMemQuota(changefeedID, changefeedInfo.Config.MemoryQuota/2, "sink")
-			m.redoMemQuota = memquota.NewMemQuota(changefeedID, changefeedInfo.Config.MemoryQuota/2, "redo")
+		redoQuota := uint64(float64(changefeedInfo.Config.MemoryQuota*changefeedInfo.Config.Consistent.MemoryQuotaPercentage) / 100)
+		sinkQuota := changefeedInfo.Config.MemoryQuota - redoQuota
+		m.sinkMemQuota = memquota.NewMemQuota(changefeedID, sinkQuota, "sink")
+		m.redoMemQuota = memquota.NewMemQuota(changefeedID, redoQuota, "redo")
+		eventCache := uint64(float64(redoQuota*changefeedInfo.Config.Consistent.EventCachePercentage) / 100)
+		if eventCache > 0 {
+			m.eventCache = newRedoEventCache(changefeedID, eventCache)
 		}
 	} else {
 		m.sinkMemQuota = memquota.NewMemQuota(changefeedID, changefeedInfo.Config.MemoryQuota, "sink")
diff --git a/pkg/config/config_test_data.go b/pkg/config/config_test_data.go
index b713adbf628..d2c15920865 100644
--- a/pkg/config/config_test_data.go
+++ b/pkg/config/config_test_data.go
@@ -76,7 +76,8 @@ const (
     "flush-worker-num": 8,
     "storage": "",
     "use-file-backend": false,
-    "enable-event-cache": false
+    "memory-quota-percentage": 50,
+    "event-cache-percentage": 0
   },
   "scheduler": {
     "enable-table-across-nodes": false,
@@ -315,7 +316,8 @@ const (
     "flush-worker-num": 8,
     "storage": "",
     "use-file-backend": false,
-    "enable-event-cache": false
+    "memory-quota-percentage": 50,
+    "event-cache-percentage": 0
   },
   "scheduler": {
     "enable-table-across-nodes": true,
@@ -468,7 +470,8 @@ const (
     "flush-worker-num": 8,
     "storage": "",
     "use-file-backend": false,
-    "enable-event-cache": false
+    "memory-quota-percentage": 50,
+    "event-cache-percentage": 0
   },
   "scheduler": {
     "enable-table-across-nodes": true,
diff --git a/pkg/config/consistent.go b/pkg/config/consistent.go
index 1b99e9c5bcc..bf90ff5dcf9 100644
--- a/pkg/config/consistent.go
+++ b/pkg/config/consistent.go
@@ -32,7 +32,11 @@ type ConsistentConfig struct {
 	FlushWorkerNum        int    `toml:"flush-worker-num" json:"flush-worker-num"`
 	Storage               string `toml:"storage" json:"storage"`
 	UseFileBackend        bool   `toml:"use-file-backend" json:"use-file-backend"`
-	EnableEventCache      bool   `toml:"enable-event-cache" json:"enable-event-cache"`
+	// ReplicaConfig.MemoryQuota * MemoryQuotaPercentage / 100 will be used for redo events.
+	MemoryQuotaPercentage uint64 `toml:"memory-quota-percentage" json:"memory-quota-percentage"`
+	// ReplicaConfig.MemoryQuota * MemoryQuotaPercentage / 100 * EventCachePercentage / 100
+	// will be used for redo cache.
+	EventCachePercentage uint64 `toml:"event-cache-percentage" json:"event-cache-percentage"`
 }
 
 // ValidateAndAdjust validates the consistency config and adjusts it if necessary.
diff --git a/pkg/config/replica_config.go b/pkg/config/replica_config.go
index 869a4458e92..1a347b4fba6 100644
--- a/pkg/config/replica_config.go
+++ b/pkg/config/replica_config.go
@@ -88,6 +88,8 @@ var defaultReplicaConfig = &ReplicaConfig{
 		FlushWorkerNum:        redo.DefaultFlushWorkerNum,
 		Storage:               "",
 		UseFileBackend:        false,
+		MemoryQuotaPercentage: 50,
+		EventCachePercentage:  0,
 	},
 	Scheduler: &ChangefeedSchedulerConfig{
 		EnableTableAcrossNodes: false,