=== modified file 'grub-core/Makefile.core.def'
--- grub-core/Makefile.core.def	2012-04-01 19:35:18 +0000
+++ grub-core/Makefile.core.def	2012-04-29 12:10:27 +0000
@@ -1840,3 +1840,7 @@
   enable = i386;
 };
 
+module = {
+  name = testspeed;
+  common = commands/testspeed.c;
+};

=== added file 'grub-core/commands/testspeed.c'
--- grub-core/commands/testspeed.c	1970-01-01 00:00:00 +0000
+++ grub-core/commands/testspeed.c	2012-04-29 20:04:05 +0000
@@ -0,0 +1,129 @@
+/* testspeed.c - Command to test file read speed  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2012  Free Software Foundation, Inc.
+ *
+ *  GRUB 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 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/mm.h>
+#include <grub/file.h>
+#include <grub/time.h>
+#include <grub/misc.h>
+#include <grub/dl.h>
+#include <grub/extcmd.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define DEFAULT_BLOCK_SIZE	65536
+
+static const struct grub_arg_option options[] =
+  {
+    {"size", 's', 0, N_("Specify size for each read operation"), 0, ARG_TYPE_INT},
+    {0, 0, 0, 0, 0, 0}
+  };
+
+static const char* grub_human_sizes[] =
+  {N_("B"), N_("KiB"), N_("MiB"), N_("GiB"), N_("TiB")};
+
+static grub_err_t
+grub_cmd_testspeed (grub_extcmd_context_t ctxt, int argc, char **args)
+{
+  struct grub_arg_list *state = ctxt->state;
+  grub_uint32_t start;
+  grub_uint32_t end;
+  grub_ssize_t block_size;
+  grub_disk_addr_t total_size;
+  char *buffer;
+  grub_file_t file;
+
+  if (argc == 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+
+  block_size = (state[0].set) ?
+    grub_strtoul (state[0].arg, 0, 0) : DEFAULT_BLOCK_SIZE;
+
+  if (block_size <= 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("invalid block size"));
+
+  buffer = grub_malloc (block_size);
+  if (buffer == NULL)
+    return grub_errno;
+
+  file = grub_file_open (args[0]);
+  if (file == NULL)
+    goto quit;
+
+  total_size = 0;
+  start = grub_get_time_ms ();
+  while (1)
+    {
+      grub_ssize_t size = grub_file_read (file, buffer, block_size);
+      if (size <= 0)
+	break;
+      total_size += size;
+    }
+  end = grub_get_time_ms ();
+  grub_file_close (file);
+
+  grub_printf_ (N_("File size: %llu B \n"), (unsigned long long) total_size);
+  grub_printf_ (N_("Elapsed time: %d.%03d s \n"), (end - start) / 1000,
+		(end - start) % 1000);
+
+  if (end != start)
+    {
+      grub_uint64_t fraction;
+      grub_uint64_t whole =
+	grub_divmod64 (total_size * 1000ULL, end - start, &fraction);
+      grub_uint64_t speed = whole * 1000ULL;
+      int sp = whole;
+      int units = 0;
+
+      while (sp / 1024)
+	{
+	  speed = (speed + 512) / 1024;
+	  sp /= 1024;
+	  units++;
+	}
+
+      if (units)
+	whole = grub_divmod64 (speed, 1000, &fraction);
+      else
+	fraction = grub_divmod64 (fraction * 1000ULL, end - start, NULL);
+
+      grub_printf_ (N_("Speed: %llu.%03d %s/s \n"),
+		    (unsigned long long) whole, (int) fraction,
+		    grub_human_sizes[units]);
+    }
+
+ quit:
+  grub_free (buffer);
+
+  return grub_errno;
+}
+
+static grub_extcmd_t cmd;
+
+GRUB_MOD_INIT(time)
+{
+  cmd = grub_register_extcmd ("testspeed", grub_cmd_testspeed, 0, N_("[-s SIZE] FILENAME"),
+			      N_("Test file read speed."),
+			      options);
+}
+
+GRUB_MOD_FINI(time)
+{
+  grub_unregister_extcmd (cmd);
+}