re #13613 rb4516 Tunables needs volatile keyword

*** 19,28 ****
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
   * Copyright (c) 2011 Bayard G. Bell. All rights reserved.
+  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
   * Copyright 2013 Joyent, Inc. All rights reserved.
   */
  
  /*
   *      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T
*** 283,293 ****
   * Returns the preferred transfer size in bytes based on
   * what network interfaces are available.
   */
  
  /* this should reflect the largest transfer size possible */
! static int nfs3_max_transfer_size = 1024 * 1024;
  
  int
  nfs3tsize(void)
  {
          /*
--- 284,294 ----
   * Returns the preferred transfer size in bytes based on
   * what network interfaces are available.
   */
  
  /* this should reflect the largest transfer size possible */
! volatile int nfs3_max_transfer_size = 1024 * 1024;
  
  int
  nfs3tsize(void)
  {
          /*
*** 295,307 ****
           * can query the appropriate transport.
           */
          return (nfs3_max_transfer_size);
  }
  
! static uint_t nfs3_max_transfer_size_clts = 32 * 1024;
! static uint_t nfs3_max_transfer_size_cots = 1024 * 1024;
! static uint_t nfs3_max_transfer_size_rdma = 1024 * 1024;
  
  uint_t
  nfs3_tsize(struct knetconfig *knp)
  {
  
--- 296,308 ----
           * can query the appropriate transport.
           */
          return (nfs3_max_transfer_size);
  }
  
! volatile uint_t nfs3_max_transfer_size_clts = 32 * 1024;
! volatile uint_t nfs3_max_transfer_size_cots = 1024 * 1024;
! volatile uint_t nfs3_max_transfer_size_rdma = 1024 * 1024;
  
  uint_t
  nfs3_tsize(struct knetconfig *knp)
  {