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diff --git a/libstdc++-v3/testsuite/performance/27_io/filebuf_sputn_unbuf.cc b/libstdc++-v3/testsuite/performance/27_io/filebuf_sputn_unbuf.cc
new file mode 100644
index 00000000..10b1746f
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/27_io/filebuf_sputn_unbuf.cc
@@ -0,0 +1,73 @@
+// 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
+// <http://www.gnu.org/licenses/>.
+
+
+#include <cstdio>
+#include <fstream>
+#include <testsuite_performance.h>
+
+// libstdc++/11378
+int main()
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+
+  const int iterations = 500000;
+  const int chunksize = 100;
+
+  char* chunk = new char[chunksize];
+
+  // C
+  FILE* file = fopen("tmp", "w+");
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    fwrite(chunk, 1, chunksize, file);
+  stop_counters(time, resource);
+  fclose(file);
+  report_performance(__FILE__, "C", time, resource);
+  clear_counters(time, resource);
+
+  // C unlocked
+  file = fopen("tmp", "w+");
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    fwrite_unlocked(chunk, 1, chunksize, file);
+  stop_counters(time, resource);
+  fclose(file);
+  report_performance(__FILE__, "C unlocked", time, resource);
+  clear_counters(time, resource);
+
+  // C++
+  filebuf buf;
+  buf.pubsetbuf(0, 0);
+  buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    buf.sputn(chunk, chunksize);
+  stop_counters(time, resource);
+  report_performance(__FILE__, "C++", time, resource);
+
+  unlink("tmp");
+  delete [] chunk;
+
+  return 0;
+}