diff --git a/bench/cmd/bench/bench.go b/bench/cmd/bench/bench.go
index 71da66862..3eeb9a706 100644
--- a/bench/cmd/bench/bench.go
+++ b/bench/cmd/bench/bench.go
@@ -326,6 +326,7 @@ var run = cli.Command{
 		numResolves := benchscore.GetByTag(benchscore.DNSResolve)
 		numDNSFailed := benchscore.GetByTag(benchscore.DNSFailed)
 		msgs = append(msgs, fmt.Sprintf("名前解決成功数 %d", numResolves))
+		lgr.Infof("DNSAttacker並列数: %d", benchmarker.attackParallelis)
 		lgr.Infof("名前解決成功数: %d", numResolves)
 		lgr.Infof("名前解決失敗数: %d", numDNSFailed)
 
diff --git a/bench/cmd/bench/benchmarker.go b/bench/cmd/bench/benchmarker.go
index 0b0808df4..c0e9d1a7a 100644
--- a/bench/cmd/bench/benchmarker.go
+++ b/bench/cmd/bench/benchmarker.go
@@ -236,23 +236,25 @@ func (b *benchmarker) loadAttack(ctx context.Context, asize int64, httpClient *h
 	return nil
 }
 
+var prevNumResolved = int64(0)
+
 func (b *benchmarker) loadAttackCoordinator(ctx context.Context) {
-	ticker := time.NewTicker(1 * time.Second)
+	ticker := time.NewTicker(2 * time.Second)
 	defer ticker.Stop()
 loop:
 	for {
 		select {
 		case <-ticker.C:
 			failRate := float64(benchscore.NumDNSFailed()) / float64(benchscore.NumResolves()+benchscore.NumDNSFailed()+1)
-			if failRate < 0.01 {
-				now := time.Now()
-				d := now.Sub(b.startAt) / time.Second
-				new := int(2.0 * (1.0 + float64(d)/8.0))
-				if new > 16 {
-					new = 16
+			avg := float64(benchscore.NumResolves()-prevNumResolved) / 2.0
+			prevNumResolved = benchscore.NumResolves()
+			if failRate < 0.01 && avg/float64(b.attackParallelis) > 50.0 {
+				new := int(float64(b.attackParallelis) * 1.5)
+				if new > 15 {
+					new = 15
 				}
 				if new != b.attackParallelis {
-					b.contestantLogger.Info("DNS水責め負荷が上昇します")
+					b.contestantLogger.Info("DNS水責め負荷が上昇します", zap.Int("parallelis", new))
 					b.attackParallelis = new
 				}
 			}
@@ -354,8 +356,7 @@ func (b *benchmarker) run(ctx context.Context) error {
 	violateCh := make(chan error) // とめておく bencherror.RunViolationChecker(ctx)
 
 	loadAttackHTTPClient := b.loadAttackHTTPClient()
-	// FIXME: LIMITは負荷をみて調整したい
-	loadAttackLimiter := rate.NewLimiter(rate.Limit(1500), 1)
+	loadAttackLimiter := rate.NewLimiter(rate.Limit(3000), 1)
 	go func() { b.loadAttackCoordinator(ctx) }()
 
 	for {
diff --git a/bench/scenario/core_pretest_normal.go b/bench/scenario/core_pretest_normal.go
index eadb36fa6..6520c13e9 100644
--- a/bench/scenario/core_pretest_normal.go
+++ b/bench/scenario/core_pretest_normal.go
@@ -148,6 +148,15 @@ func NormalLivestreamPretest(ctx context.Context, contestantLogger *zap.Logger,
 		return err
 	}
 
+	clientNoSession, err := isupipe.NewCustomResolverClient(
+		contestantLogger,
+		dnsResolver,
+		agent.WithTimeout(config.PretestTimeout),
+	)
+	if err != nil {
+		return err
+	}
+
 	if err := client.Login(ctx, &isupipe.LoginRequest{
 		Username: testUser.Name,
 		Password: defaultPasswordOrPretest(testUser.Name),
@@ -192,6 +201,20 @@ func NormalLivestreamPretest(ctx context.Context, contestantLogger *zap.Logger,
 		}
 	}
 
+	{
+		tagr, err := clientNoSession.GetTags(ctx)
+		if err != nil {
+			return err
+		}
+		tagn := map[int64]string{}
+		for _, tag := range tagr.Tags {
+			tagn[tag.ID] = tag.Name
+		}
+		if !reflect.DeepEqual(tagn, poolTags) {
+			return fmt.Errorf("取得した tag 一覧が正しくありません。過不足があります")
+		}
+	}
+
 	tags := []int64{1, 103}
 	for len(tags) <= 10 {
 		t := rand.Intn(len(tagResponse.Tags))
@@ -322,7 +345,7 @@ func NormalLivestreamPretest(ctx context.Context, contestantLogger *zap.Logger,
 
 	{
 		//検索2回目
-		searchedStream, err := client.SearchLivestreams(ctx, isupipe.WithSearchTagQueryParam("ライブ配信")) // ID:1
+		searchedStream, err := clientNoSession.SearchLivestreams(ctx, isupipe.WithSearchTagQueryParam("ライブ配信")) // ID:1
 		if err != nil {
 			return err
 		}
@@ -410,6 +433,22 @@ func NormalLivestreamPretest(ctx context.Context, contestantLogger *zap.Logger,
 				return fmt.Errorf("タグ指定なし検索結果の%d番目のlivestream.idが一致しません (expected:%d actual:%d)", randNumber+1, reserveStreams[randNumber], searchedStream[randNumber].ID)
 			}
 		}
+	}
+	{
+		// タグ指定なし検索
+		searchedStream, err := clientNoSession.SearchLivestreams(ctx, isupipe.WithLimitQueryParam(config.NumSearchLivestreams))
+		if err != nil {
+			return err
+		}
+		if len(searchedStream) != config.NumSearchLivestreams {
+			return fmt.Errorf("タグ指定なし検索結果の数が想定外です (expected:%d actual:%d)", config.NumSearchLivestreams, len(searchedStream))
+		}
+		for i := 0; i < 5; i++ {
+			randNumber := rand.Intn(20)
+			if searchedStream[randNumber].ID != reserveStreams[randNumber] {
+				return fmt.Errorf("タグ指定なし検索結果の%d番目のlivestream.idが一致しません (expected:%d actual:%d)", randNumber+1, reserveStreams[randNumber], searchedStream[randNumber].ID)
+			}
+		}
 		for i := 0; i < 5; i++ {
 			randNumber := rand.Intn(20) + 25
 			livestreamID := int64(scheduler.GetLivestreamLength() + len(reserveStreams) - randNumber)