diff --git a/test/cpp/qps/gen_build_yaml.py b/test/cpp/qps/gen_build_yaml.py
index 369da2c8ca2..e4d9e7ac58f 100755
--- a/test/cpp/qps/gen_build_yaml.py
+++ b/test/cpp/qps/gen_build_yaml.py
@@ -82,7 +82,7 @@ print yaml.dump({
       'defaults': 'boringssl',
       'cpu_cost': guess_cpu(scenario_json),
       'exclude_configs': [],
-      'timeout_seconds': 3*60
+      'timeout_seconds': 6*60
     }
     for scenario_json in scenario_config.CXXLanguage().scenarios()
     if 'scalable' in scenario_json.get('CATEGORIES', [])
diff --git a/tools/run_tests/tests.json b/tools/run_tests/tests.json
index 7bace54299f..49c6d38300e 100644
--- a/tools/run_tests/tests.json
+++ b/tools/run_tests/tests.json
@@ -35266,7 +35266,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_ping_pong_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35287,7 +35287,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35308,7 +35308,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_qps_one_server_core_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35329,7 +35329,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_client_sync_server_unary_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35350,7 +35350,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_client_sync_server_streaming_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35371,7 +35371,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_ping_pong_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35392,7 +35392,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35413,7 +35413,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_qps_unconstrained_secure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35434,7 +35434,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_ping_pong_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35455,7 +35455,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35476,7 +35476,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_qps_unconstrained_secure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35497,7 +35497,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_ping_pong_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35518,7 +35518,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35539,7 +35539,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_qps_unconstrained_secure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35560,7 +35560,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_ping_pong_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35581,7 +35581,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_qps_unconstrained_secure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35602,7 +35602,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_qps_unconstrained_secure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35623,7 +35623,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_ping_pong_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35644,7 +35644,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35665,7 +35665,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_generic_async_streaming_qps_one_server_core_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35686,7 +35686,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_client_sync_server_unary_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35707,7 +35707,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_client_sync_server_streaming_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35728,7 +35728,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_ping_pong_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35749,7 +35749,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35770,7 +35770,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_unary_qps_unconstrained_insecure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35791,7 +35791,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_ping_pong_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35812,7 +35812,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35833,7 +35833,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_unary_qps_unconstrained_insecure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35854,7 +35854,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_ping_pong_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35875,7 +35875,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35896,7 +35896,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_sync_streaming_qps_unconstrained_insecure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35917,7 +35917,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_ping_pong_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35938,7 +35938,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_qps_unconstrained_insecure", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [
@@ -35959,7 +35959,7 @@
       "linux"
     ], 
     "shortname": "json_run_localhost:cpp_protobuf_async_streaming_qps_unconstrained_insecure_500kib_resource_quota", 
-    "timeout_seconds": 180
+    "timeout_seconds": 360
   }, 
   {
     "args": [