diff --git a/benchtests/Makefile b/benchtests/Makefile
index fbdeadf..e35baa6 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -38,7 +38,7 @@ string-benchset := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
 		   strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
 		   strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok \
 		   strcoll memcpy-large memcpy-random memmove-large memset-large \
-		   memcpy-walk
+		   memcpy-walk memset-walk
 
 # Build and run locale-dependent benchmarks only if we're building natively.
 ifeq (no,$(cross-compiling))
diff --git a/benchtests/bench-memset-walk.c b/benchtests/bench-memset-walk.c
new file mode 100644
index 0000000..e0d186d
--- /dev/null
+++ b/benchtests/bench-memset-walk.c
@@ -0,0 +1,137 @@
+/* Measure memset function throughput with large data sizes.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define TEST_MAIN
+#ifndef WIDE
+# define TEST_NAME "memset"
+#else
+# define TEST_NAME "wmemset"
+#endif /* WIDE */
+#define START_SIZE (1)
+#define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
+#define TIMEOUT (20 * 60)
+#include "bench-string.h"
+
+#ifndef WIDE
+# define MEMSET memset
+# define CHAR char
+# define SIMPLE_MEMSET simple_memset
+# define MEMCMP memcmp
+#else
+# include <wchar.h>
+# define MEMSET wmemset
+# define CHAR wchar_t
+# define SIMPLE_MEMSET simple_wmemset
+# define MEMCMP wmemcmp
+#endif /* WIDE */
+
+#include <assert.h>
+#include "json-lib.h"
+
+
+typedef CHAR *(*proto_t) (CHAR *, int, size_t);
+
+CHAR *
+inhibit_loop_to_libcall
+SIMPLE_MEMSET (CHAR *s, int c, size_t n)
+{
+  CHAR *r = s, *end = s + n;
+  while (r < end)
+    *r++ = c;
+  return s;
+}
+
+IMPL (SIMPLE_MEMSET, 1)
+
+static void
+do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
+	     int c __attribute ((unused)), size_t n)
+{
+  size_t i, iters = MIN_PAGE_SIZE;
+  timing_t start, stop, cur;
+
+  TIMING_NOW (start);
+  for (i = 0; i < iters && s <= s_end; s = s + 1, i = i + n)
+    CALL (impl, s, c, n);
+  TIMING_NOW (stop);
+
+  TIMING_DIFF (cur, start, stop);
+
+  json_element_double (json_ctx, (double) iters / (double) cur);
+}
+
+static void
+do_test (json_ctx_t *json_ctx, int c, size_t len)
+{
+  json_element_object_begin (json_ctx);
+  json_attr_uint (json_ctx, "length", len);
+  json_attr_uint (json_ctx, "char", c);
+  json_array_begin (json_ctx, "timings");
+
+  FOR_EACH_IMPL (impl, 0)
+    {
+      do_one_test (json_ctx, impl, (CHAR *) buf1,
+		   (CHAR *) buf1 + MIN_PAGE_SIZE - len, c, len);
+      realloc_bufs ();
+    }
+
+  json_array_end (json_ctx);
+  json_element_object_end (json_ctx);
+}
+
+int
+test_main (void)
+{
+  json_ctx_t json_ctx;
+  size_t i;
+
+  test_init ();
+
+  json_init (&json_ctx, 0, stdout);
+
+  json_document_begin (&json_ctx);
+  json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
+
+  json_attr_object_begin (&json_ctx, "functions");
+  json_attr_object_begin (&json_ctx, TEST_NAME);
+  json_attr_string (&json_ctx, "bench-variant", "walk");
+
+  json_array_begin (&json_ctx, "ifuncs");
+  FOR_EACH_IMPL (impl, 0)
+    json_element_string (&json_ctx, impl->name);
+  json_array_end (&json_ctx);
+
+  json_array_begin (&json_ctx, "results");
+  for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
+      /* Test length alignments from 0-16 bytes.  */
+      for (int j = 0; j < i && j < 16; j++)
+	do_test (&json_ctx, 65, i + j);
+
+  for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
+      for (int j = 0; j < i && j < 16; j++)
+	do_test (&json_ctx, 0, i + j);
+
+  json_array_end (&json_ctx);
+  json_attr_object_end (&json_ctx);
+  json_attr_object_end (&json_ctx);
+  json_document_end (&json_ctx);
+
+  return ret;
+}
+
+#include <support/test-driver.c>
