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diff --git a/libstdc++-v3/testsuite/performance/27_io/stringbuf_overflow.cc b/libstdc++-v3/testsuite/performance/27_io/stringbuf_overflow.cc
new file mode 100644
index 00000000..86eb7d1d
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/27_io/stringbuf_overflow.cc
@@ -0,0 +1,51 @@
+// Copyright (C) 2004, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// .
+
+
+#include
+#include
+
+// libstdc++/16401 ostringstream in gcc 3.4.x very slow for big data
+void test01()
+{
+ using namespace std;
+ using namespace __gnu_test;
+
+ time_counter time;
+ resource_counter resource;
+
+ for(unsigned n = 10000; n <= 10000000; n *= 10)
+ {
+ ostringstream oss;
+ oss << "size = " << n;
+
+ ostringstream str;
+ start_counters(time, resource);
+ for(unsigned i = 0; i < n; ++i)
+ str << 'a';
+ stop_counters(time, resource);
+
+ report_performance(__FILE__, oss.str(), time, resource);
+ clear_counters(time, resource);
+ }
+}
+
+int main()
+{
+ test01();
+ return 0;
+}