diff --git a/trunk/conf/srs.conf b/trunk/conf/srs.conf
index d234e1d71..7e136eb8c 100755
--- a/trunk/conf/srs.conf
+++ b/trunk/conf/srs.conf
@@ -31,6 +31,9 @@ vhost demo.srs.com {
     gop_cache       on;
     queue_length    30;
     forward         127.0.0.1:19350;
+    bandcheck {
+        enabled         off;
+    }
     hls {
         enabled         on;
         hls_path        ./objs/nginx/html;
@@ -200,6 +203,31 @@ vhost dev {
     }
 }
 
+# vhost for bandwidth check
+# generally, the bandcheck vhost must be: bandcheck.srs.com,
+# or need to modify the vhost of client.
+vhost bandcheck.srs.com {
+    enabled         on;
+    chunk_size      65000;
+    # bandwidth check config.
+    bandcheck {
+        # whether support bandwidth check,
+        # default: off.
+        enabled         on;
+        # the key for server to valid,
+        # if invalid key, server disconnect and abort the bandwidth check.
+        key             35c9b402c12a7246868752e2878f7e0e;
+        # the interval in seconds for bandwidth check,
+        # server donot allow new test request.
+        # default: 30
+        interval        30;
+        # the max available check bandwidth in kbps.
+        # to avoid attack of bandwidth check.
+        # default: 1000
+        limit_kbps      4000;
+    }
+}
+
 # set the chunk size of vhost.
 vhost chunksize.vhost.com {
     # the default chunk size is 128, max is 65536,
diff --git a/trunk/src/core/srs_core.cpp b/trunk/src/core/srs_core.cpp
old mode 100644
new mode 100755
index 090dfe80f..8ef6cceca
--- a/trunk/src/core/srs_core.cpp
+++ b/trunk/src/core/srs_core.cpp
@@ -43,7 +43,7 @@ void srs_update_system_time_ms()
     gettimeofday(&now, NULL);
 
     // we must convert the tv_sec/tv_usec to int64_t.
-    _srs_system_time_us_cache = now.tv_sec * 1000 * 1000 + now.tv_usec;
+    _srs_system_time_us_cache = ((int64_t)now.tv_sec) * 1000 * 1000 + (int64_t)now.tv_usec;
     
     _srs_system_time_us_cache = srs_max(0, _srs_system_time_us_cache);
 }
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index bb4964adb..bcb795a30 100755
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -2,7 +2,6 @@
 The MIT License (MIT)
 
 Copyright (c) 2013 winlin
-Copyright (c) 2013 wenjiegit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
diff --git a/trunk/src/core/srs_core_config.cpp b/trunk/src/core/srs_core_config.cpp
old mode 100644
new mode 100755
index aa2d1a1e3..897746b5b
--- a/trunk/src/core/srs_core_config.cpp
+++ b/trunk/src/core/srs_core_config.cpp
@@ -2,7 +2,6 @@
 The MIT License (MIT)
 
 Copyright (c) 2013 winlin
-Copyright (c) 2013 wenjiegit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
diff --git a/trunk/src/core/srs_core_config.hpp b/trunk/src/core/srs_core_config.hpp
old mode 100644
new mode 100755
index d165490ea..e9f2e3977
--- a/trunk/src/core/srs_core_config.hpp
+++ b/trunk/src/core/srs_core_config.hpp
@@ -2,7 +2,6 @@
 The MIT License (MIT)
 
 Copyright (c) 2013 winlin
-Copyright (c) 2013 wenjiegit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in