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3740 Poor ZFS send / receive performance due to snapshot hold / release processing
Submitted by: Steven Hartland <steven.hartland@multiplay.co.uk>

@@ -20,10 +20,11 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2012 by Delphix. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright (c) 2013 Steven Hartland. All rights reserved.
  */
 
 /*
  * The objective of this program is to provide a DMU/ZAP/SPA stress test
  * that runs entirely in userland, is easy to use, and easy to extend.

@@ -4709,11 +4710,11 @@
                     fullname, error);
         }
 
         error = user_release_one(fullname, tag);
         if (error)
-                fatal(0, "user_release_one(%s)", fullname, tag);
+                fatal(0, "user_release_one(%s, %s) = %d", fullname, tag, error);
 
         VERIFY3U(dmu_objset_hold(fullname, FTAG, &origin), ==, ENOENT);
 
 out:
         (void) rw_unlock(&ztest_name_lock);