OS-5192 need faster clock_gettime
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Joshua M. Clulow <jmc@joyent.com>
Reviewed by: Ryan Zezeski <ryan@zinascii.com>

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2015 by Delphix. All rights reserved.
+ * Copyright 2016 Joyent, Inc.
  */
 
 /*      Copyright (c) 1988 AT&T */
 /*        All Rights Reserved   */
 

@@ -52,10 +53,14 @@
 /*
  * Machine dependent parameters and limits.
  */
 
 #if defined(__amd64)
+/*
+ * If NCPU grows beyond 256, sizing for the x86 comm page will require
+ * adjustment.
+ */
 #define NCPU    256
 #define NCPU_LOG2       8
 #elif defined(__i386)
 #define NCPU    32
 #define NCPU_LOG2       5