diff --git a/README.md b/README.md
index 03c32d9..6a1aa97 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,76 @@
 
 This repository includes performance test tools of dragonfly.
 
-## Directories
+## Usage
 
-### `/benchmark`
+### Installation
 
-Provide dragonfly performance test solution and related metics.
+```shell
+go install github.com/dragonflyoss/perf-tests/cmd/dfbench@latest
+```
+
+### Install Dragonfly for testing
+
+Install Dragonfly using Helm chart, refer to [Dragonfly Helm Chart](https://d7y.io/docs/next/getting-started/installation/helm-charts/).
+
+<!-- markdownlint-disable -->
+
+```shell
+$ helm repo add dragonfly https://dragonflyoss.github.io/helm-charts/
+$ helm install --wait --create-namespace --namespace dragonfly-system dragonfly dragonfly/dragonfly
+NAME: dragonfly
+LAST DEPLOYED: Thu Apr 18 19:26:39 2024
+NAMESPACE: dragonfly-system
+STATUS: deployed
+REVISION: 1
+TEST SUITE: None
+NOTES:
+1. Get the scheduler address by running these commands:
+  export SCHEDULER_POD_NAME=$(kubectl get pods --namespace dragonfly-system -l "app=dragonfly,release=dragonfly,component=scheduler" -o jsonpath={.items[0].metadata.name})
+  export SCHEDULER_CONTAINER_PORT=$(kubectl get pod --namespace dragonfly-system $SCHEDULER_POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  kubectl --namespace dragonfly-system port-forward $SCHEDULER_POD_NAME 8002:$SCHEDULER_CONTAINER_PORT
+  echo "Visit http://127.0.0.1:8002 to use your scheduler"
+
+2. Get the dfdaemon port by running these commands:
+  export DFDAEMON_POD_NAME=$(kubectl get pods --namespace dragonfly-system -l "app=dragonfly,release=dragonfly,component=dfdaemon" -o jsonpath={.items[0].metadata.name})
+  export DFDAEMON_CONTAINER_PORT=$(kubectl get pod --namespace dragonfly-system $DFDAEMON_POD_NAME -o jsonpath="{.spec.containers[0].ports[0].containerPort}")
+  You can use $DFDAEMON_CONTAINER_PORT as a proxy port in Node.
+
+3. Configure runtime to use dragonfly:
+  https://d7y.io/docs/getting-started/quick-start/kubernetes/
+```
+
+<!-- markdownlint-restore -->
+
+Install file server for testing.
+
+```shell
+kubectl apply -f https://raw.githubusercontent.com/dragonflyoss/perf-tests/main/tools/file-server/file-server.yaml
+```
+
+### Run performance testing
+
+```text
+$ dfbench dragonfly
+Running benchmark for all size levels by DFGET ...
++-----------------+-------+-------------+-------------+-------------+
+| FILE SIZE LEVEL | TIMES |  MIN COST   |  MAX COST   |  AVG COST   |
++-----------------+-------+-------------+-------------+-------------+
+| Nano(1B)        | 3     | 528.46ms    | 717.28ms    | 648.17ms    |
++-----------------+-------+-------------+-------------+-------------+
+| Micro(1KB)      | 3     | 691.76ms    | 967.26ms    | 798.55ms    |
++-----------------+-------+-------------+-------------+-------------+
+| Small(1MB)      | 3     | 671.12ms    | 1250.22ms   | 897.32ms    |
++-----------------+-------+-------------+-------------+-------------+
+| Medium(10MB)    | 3     | 716.83ms    | 971.49ms    | 816.14ms    |
++-----------------+-------+-------------+-------------+-------------+
+| Large(1GB)      | 3     | 4855.28ms   | 6069.76ms   | 5526.63ms   |
++-----------------+-------+-------------+-------------+-------------+
+| XLarge(10GB)    | 3     | 37428.71ms  | 41206.96ms  | 38794.96ms  |
++-----------------+-------+-------------+-------------+-------------+
+| XXLarge(30GB)   | 3     | 102279.19ms | 139299.07ms | 118039.78ms |
++-----------------+-------+-------------+-------------+-------------+
+```
 
 ## Community
 
@@ -17,7 +82,6 @@ Join the conversation and help the community.
 - **Developer Group**: <dragonfly-developers@googlegroups.com>
 - **Github Discussions**: [Dragonfly Discussion Forum](https://github.com/dragonflyoss/Dragonfly2/discussions)
 - **Twitter**: [@dragonfly_oss](https://twitter.com/dragonfly_oss)
-- **DingTalk**: [22880028764](https://qr.dingtalk.com/action/joingroup?code=v1,k1,pkV9IbsSyDusFQdByPSK3HfCG61ZCLeb8b/lpQ3uUqI=&_dt_no_comment=1&origin=11)
 
 ## Contributing
 
diff --git a/pkg/backend/file_server.go b/pkg/backend/file_server.go
index f3a703b..82af27d 100644
--- a/pkg/backend/file_server.go
+++ b/pkg/backend/file_server.go
@@ -26,6 +26,27 @@ import (
 
 type FileSizeLevel string
 
+func (f FileSizeLevel) String() string {
+	switch f {
+	case FileSizeLevelNano:
+		return "Nano(1B)"
+	case FileSizeLevelMicro:
+		return "Micro(1KB)"
+	case FileSizeLevelSmall:
+		return "Small(1MB)"
+	case FileSizeLevelMedium:
+		return "Medium(10MB)"
+	case FileSizeLevelLarge:
+		return "Large(1GB)"
+	case FileSizeLevelXLarge:
+		return "XLarge(10GB)"
+	case FileSizeLevelXXLarge:
+		return "XXLarge(30GB)"
+	default:
+		return "Unknow"
+	}
+}
+
 const (
 	FileSizeLevelNano    FileSizeLevel = "nano"
 	FileSizeLevelMicro   FileSizeLevel = "micro"
@@ -36,6 +57,16 @@ const (
 	FileSizeLevelXXLarge FileSizeLevel = "xxlarge"
 )
 
+var FileSizeLevels = []FileSizeLevel{
+	FileSizeLevelNano,
+	FileSizeLevelMicro,
+	FileSizeLevelSmall,
+	FileSizeLevelMedium,
+	FileSizeLevelLarge,
+	FileSizeLevelXLarge,
+	FileSizeLevelXXLarge,
+}
+
 type FileServer interface {
 	GetFileURL(FileSizeLevel, string) (*url.URL, error)
 }
diff --git a/pkg/stats/stats.go b/pkg/stats/stats.go
index fe3fbae..953e4f4 100644
--- a/pkg/stats/stats.go
+++ b/pkg/stats/stats.go
@@ -125,6 +125,7 @@ func printTable(downloads map[backend.FileSizeLevel][]*Download) {
 	table := tablewriter.NewWriter(os.Stdout)
 	table.SetHeader([]string{"File Size Level", "Times", "Min Cost", "Max Cost", "Avg Cost"})
 
+	rows := map[backend.FileSizeLevel][]string{}
 	for fileSizeLevel, records := range downloads {
 		var minCost, maxCost, totalCost time.Duration
 		if len(records) > 0 {
@@ -145,13 +146,20 @@ func printTable(downloads map[backend.FileSizeLevel][]*Download) {
 		}
 
 		avgCost := totalCost / time.Duration(len(records))
-		table.Append([]string{
-			fmt.Sprintf("%s", fileSizeLevel),
+		rows[fileSizeLevel] = []string{
+			fileSizeLevel.String(),
 			fmt.Sprintf("%d", len(records)),
 			formatDuration(minCost),
 			formatDuration(maxCost),
 			formatDuration(avgCost),
-		})
+		}
+	}
+
+	for _, fileSizeLevel := range backend.FileSizeLevels {
+		if row, ok := rows[fileSizeLevel]; ok {
+			table.Append(row)
+			continue
+		}
 	}
 
 	table.SetAlignment(tablewriter.ALIGN_LEFT)