Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.471
diff -u -r1.471 system.install
--- modules/system/system.install	3 Jun 2010 13:20:05 -0000	1.471
+++ modules/system/system.install	3 Jun 2010 18:08:20 -0000
@@ -164,6 +164,26 @@
     $requirements['database_extensions']['value'] = $t('Enabled');
   }
 
+  // Check InnoDB configuration.
+  if ($phase == 'runtime' && db_driver() == 'mysql') {
+
+    $variable = db_query("SHOW VARIABLES LIKE 'innodb_flush_log_at_trx_commit'")
+      ->fetchAssoc();
+
+    if ($variable == array(
+      'variable_name' => 'innodb_flush_log_at_trx_commit',
+      'value' => 1,
+    ))
+    {
+      $requirements['innodb_flush_log_at_trx_commit'] = array(
+        'title' => $t('InnoDB configuration'),
+        'value' => $t('Unsupported'),
+        'description' => $t('InnoDB variable <a href="http://dev.mysql.com/doc/refman/5.1/en/innodb-parameters.html#sysvar_innodb_flush_log_at_trx_commit">innodb_flush_log_at_trx_commit</a> is set to 1. This will significantly reduce performance as a disk flush is performed after every database write.'),
+        'severity' => REQUIREMENT_WARNING,
+      );
+    }
+  }
+
   // Test PHP memory_limit
   $memory_limit = ini_get('memory_limit');
   $requirements['php_memory_limit'] = array(