lnet/klnds/gnilnd/gnilnd_modparams.c

   1 /*
   2  * Copyright (C) 2004 Cluster File Systems, Inc.
   3  *
   4  * Copyright (C) 2009-2012 Cray, Inc.
   5  *
   6  *   Derived from work by: Eric Barton <eric@bartonsoftware.com>
   7  *   Author: Nic Henke <nic@cray.com>
   8  *
   9  *   This file is part of Lustre, http://www.lustre.org.
  10  *
  11  *   Lustre is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   Lustre is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with Lustre; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  */
  25
  26 #include "gnilnd.h"
  27
  28 static int credits = 256;
  29 CFS_MODULE_PARM(credits, "i", int, 0444,
  30                 "# concurrent sends");
  31
  32 static int eager_credits = 256 * 1024;
  33 CFS_MODULE_PARM(eager_credits, "i", int, 0444,
  34                 "# eager buffers");
  35
  36 static int peer_credits = 16;
  37 CFS_MODULE_PARM(peer_credits, "i", int, 0444,
  38                 "# LNet peer credits");
  39
  40 /* NB - we'll not actually limit sends to this, we just size the mailbox buffer
  41  * such that at most we'll have concurrent_sends * max_immediate messages
  42  * in the mailbox */
  43 static int concurrent_sends = 0;
  44 CFS_MODULE_PARM(concurrent_sends, "i", int, 0444,
  45                 "# concurrent HW sends to 1 peer");
  46
  47 /* default for 2k nodes @ 16 peer credits */
  48 static int fma_cq_size = 32768;
  49 CFS_MODULE_PARM(fma_cq_size, "i", int, 0444,
  50                 "size of the completion queue");
  51
  52 static int timeout = GNILND_BASE_TIMEOUT;
  53 /* can't change @ runtime because LNet gets NI data at startup from
  54  * this value */
  55 CFS_MODULE_PARM(timeout, "i", int, 0444,
  56                 "communications timeout (seconds)");
  57
  58 /* time to wait between datagram timeout and sending of next dgram */
  59 static int min_reconnect_interval = GNILND_MIN_RECONNECT_TO;
  60 CFS_MODULE_PARM(min_reconnect_interval, "i", int, 0644,
  61                 "minimum connection retry interval (seconds)");
  62
  63 /* if this goes longer than timeout, we'll timeout the TX before
  64  * the dgram */
  65 static int max_reconnect_interval = GNILND_MAX_RECONNECT_TO;
  66 CFS_MODULE_PARM(max_reconnect_interval, "i", int, 0644,
  67                 "maximum connection retry interval (seconds)");
  68
  69 static int max_immediate = (2<<10);
  70 CFS_MODULE_PARM(max_immediate, "i", int, 0644,
  71                 "immediate/RDMA breakpoint");
  72
  73 static int checksum = GNILND_CHECKSUM_DEFAULT;
  74 CFS_MODULE_PARM(checksum, "i", int, 0644,
  75                 "0: None, 1: headers, 2: short msg, 3: all traffic");
  76
  77 static int checksum_dump = 0;
  78 CFS_MODULE_PARM(checksum_dump, "i", int, 0644,
  79                 "0: None, 1: dump log on failure, 2: payload data to D_INFO log");
  80
  81 static int bte_dlvr_mode = GNILND_RDMA_DLVR_OPTION;
  82 CFS_MODULE_PARM(bte_dlvr_mode, "i", int, 0644,
  83                 "enable hashing for BTE (RDMA) transfers");
  84
  85 static int bte_relaxed_ordering = 1;
  86 CFS_MODULE_PARM(bte_relaxed_ordering, "i", int, 0644,
  87                 "enable relaxed ordering (PASSPW) for BTE (RDMA) transfers");
  88
  89 #ifdef CONFIG_MK1OM
  90 static int ptag = GNI_PTAG_LND_KNC;
  91 #else
  92 static int ptag = GNI_PTAG_LND;
  93 #endif
  94 CFS_MODULE_PARM(ptag, "i", int, 0444,
  95                 "ptag for Gemini CDM");
  96
  97 static int max_retransmits = 1024;
  98 CFS_MODULE_PARM(max_retransmits, "i", int, 0444,
  99                 "max retransmits for FMA");
 100
 101 static int nwildcard = 4;
 102 CFS_MODULE_PARM(nwildcard, "i", int, 0444,
 103                 "# wildcard datagrams to post per net (interface)");
 104
 105 static int nice = -20;
 106 CFS_MODULE_PARM(nice, "i", int, 0444,
 107                 "nice value for kgnilnd threads, default -20");
 108
 109 static int rdmaq_intervals = 4;
 110 CFS_MODULE_PARM(rdmaq_intervals, "i", int, 0644,
 111                 "# intervals per second for rdmaq throttling, default 4, 0 to disable");
 112
 113 static int loops = 100;
 114 CFS_MODULE_PARM(loops, "i", int, 0644,
 115                 "# of loops before scheduler is friendly, default 100");
 116
 117 static int hash_size = 503;
 118 CFS_MODULE_PARM(hash_size, "i", int, 0444,
 119                 "prime number for peer/conn hash sizing, default 503");
 120
 121 static int peer_health = 0;
 122 CFS_MODULE_PARM(peer_health, "i", int, 0444,
 123                 "Disable peer timeout for LNet peer health, default off, > 0 to enable");
 124
 125 static int peer_timeout = -1;
 126 CFS_MODULE_PARM(peer_timeout, "i", int, 0444,
 127                 "Peer timeout used for peer_health, default based on gnilnd timeout, > -1 to manually set");
 128
 129 static int vmap_cksum = 0;
 130 CFS_MODULE_PARM(vmap_cksum, "i", int, 0644,
 131                 "use vmap for all kiov checksumming, default off");
 132
 133 static int mbox_per_block = GNILND_FMABLK;
 134 CFS_MODULE_PARM(mbox_per_block, "i", int, 0644,
 135                 "mailboxes per block");
 136
 137 static int nphys_mbox = 0;
 138 CFS_MODULE_PARM(nphys_mbox, "i", int, 0444,
 139                 "# mbox to preallocate from physical memory, default 0");
 140
 141 static int mbox_credits = GNILND_MBOX_CREDITS;
 142 CFS_MODULE_PARM(mbox_credits, "i", int, 0644,
 143                 "number of credits per mailbox");
 144
 145 static int sched_threads = GNILND_SCHED_THREADS;
 146 CFS_MODULE_PARM(sched_threads, "i", int, 0444,
 147                 "number of threads for moving data");
 148
 149 static int net_hash_size = 11;
 150 CFS_MODULE_PARM(net_hash_size, "i", int, 0444,
 151                 "prime number for net hash sizing, default 11");
 152
 153 static int hardware_timeout = GNILND_HARDWARE_TIMEOUT;
 154 CFS_MODULE_PARM(hardware_timeout, "i", int, 0444,
 155                 "maximum time for traffic to get from one node to another");
 156
 157 static int mdd_timeout = GNILND_MDD_TIMEOUT;
 158 CFS_MODULE_PARM(mdd_timeout, "i", int, 0644,
 159                 "maximum time (in minutes) for mdd to be held");
 160
 161 static int sched_timeout = GNILND_SCHED_TIMEOUT;
 162 CFS_MODULE_PARM(sched_timeout, "i", int, 0644,
 163                 "scheduler aliveness in seconds max time");
 164
 165 static int sched_nice = GNILND_SCHED_NICE;
 166 CFS_MODULE_PARM(sched_nice, "i", int, 0444,
 167                 "scheduler's nice setting, default compute 0 service -20");
 168
 169 static int reverse_rdma = GNILND_REVERSE_RDMA;
 170 CFS_MODULE_PARM(reverse_rdma, "i", int, 0644,
 171                 "Normal 0: Reverse GET: 1 Reverse Put: 2 Reverse Both: 3");
 172
 173 static int dgram_timeout = GNILND_DGRAM_TIMEOUT;
 174 CFS_MODULE_PARM(dgram_timeout, "i", int, 0644,
 175                 "dgram thread aliveness seconds max time");
 176
 177 static int efault_lbug = 0;
 178 CFS_MODULE_PARM(efault_lbug, "i", int, 0644,
 179                 "If a compute receives an EFAULT in"
 180                 " a message should it LBUG. 0 off 1 on");
 181
 182 static int fast_reconn = GNILND_FAST_RECONNECT;
 183 CFS_MODULE_PARM(fast_reconn, "i", int, 0644,
 184                 "fast reconnect on connection timeout");
 185
 186 static int max_conn_purg = GNILND_PURGATORY_MAX;
 187 CFS_MODULE_PARM(max_conn_purg, "i", int, 0644,
 188                 "Max number of connections per peer in purgatory");
 189
 190 kgn_tunables_t kgnilnd_tunables = {
 191         .kgn_min_reconnect_interval = &min_reconnect_interval,
 192         .kgn_max_reconnect_interval = &max_reconnect_interval,
 193         .kgn_credits                = &credits,
 194         .kgn_peer_credits           = &peer_credits,
 195         .kgn_concurrent_sends       = &concurrent_sends,
 196         .kgn_fma_cq_size            = &fma_cq_size,
 197         .kgn_timeout                = &timeout,
 198         .kgn_max_immediate          = &max_immediate,
 199         .kgn_checksum               = &checksum,
 200         .kgn_checksum_dump          = &checksum_dump,
 201         .kgn_bte_dlvr_mode          = &bte_dlvr_mode,
 202         .kgn_bte_relaxed_ordering   = &bte_relaxed_ordering,
 203         .kgn_ptag                   = &ptag,
 204         .kgn_max_retransmits        = &max_retransmits,
 205         .kgn_nwildcard              = &nwildcard,
 206         .kgn_nice                   = &nice,
 207         .kgn_rdmaq_intervals        = &rdmaq_intervals,
 208         .kgn_loops                  = &loops,
 209         .kgn_peer_hash_size         = &hash_size,
 210         .kgn_peer_health            = &peer_health,
 211         .kgn_peer_timeout           = &peer_timeout,
 212         .kgn_vmap_cksum             = &vmap_cksum,
 213         .kgn_mbox_per_block         = &mbox_per_block,
 214         .kgn_nphys_mbox             = &nphys_mbox,
 215         .kgn_mbox_credits           = &mbox_credits,
 216         .kgn_sched_threads          = &sched_threads,
 217         .kgn_net_hash_size          = &net_hash_size,
 218         .kgn_hardware_timeout       = &hardware_timeout,
 219         .kgn_mdd_timeout            = &mdd_timeout,
 220         .kgn_sched_timeout          = &sched_timeout,
 221         .kgn_sched_nice             = &sched_nice,
 222         .kgn_reverse_rdma           = &reverse_rdma,
 223         .kgn_dgram_timeout          = &dgram_timeout,
 224         .kgn_eager_credits          = &eager_credits,
 225         .kgn_fast_reconn            = &fast_reconn,
 226         .kgn_efault_lbug            = &efault_lbug,
 227         .kgn_max_purgatory          = &max_conn_purg
 228 };
 229
 230 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 231 static struct ctl_table kgnilnd_ctl_table[] = {
 232         {
 233                 INIT_CTL_NAME
 234                 .procname = "min_reconnect_interval",
 235                 .data     = &min_reconnect_interval,
 236                 .maxlen   = sizeof(int),
 237                 .mode     = 0644,
 238                 .proc_handler = &proc_dointvec
 239         },
 240         {
 241                 INIT_CTL_NAME
 242                 .procname = "max_reconnect_interval",
 243                 .data     = &max_reconnect_interval,
 244                 .maxlen   = sizeof(int),
 245                 .mode     = 0644,
 246                 .proc_handler = &proc_dointvec
 247         },
 248         {
 249                 INIT_CTL_NAME
 250                 .procname = "credits",
 251                 .data     = &credits,
 252                 .maxlen   = sizeof(int),
 253                 .mode     = 0444,
 254                 .proc_handler = &proc_dointvec
 255         },
 256         {
 257                 INIT_CTL_NAME
 258                 .procname = "peer_credits",
 259                 .data     = &peer_credits,
 260                 .maxlen   = sizeof(int),
 261                 .mode     = 0444,
 262                 .proc_handler = &proc_dointvec
 263         },
 264         {
 265                 INIT_CTL_NAME
 266                 .procname = "fma_cq_size",
 267                 .data     = &fma_cq_size,
 268                 .maxlen   = sizeof(int),
 269                 .mode     = 0444,
 270                 .proc_handler = &proc_dointvec
 271         },
 272         {
 273                 INIT_CTL_NAME
 274                 .procname = "timeout",
 275                 .data     = &timeout,
 276                 .maxlen   = sizeof(int),
 277                 .mode     = 0444,
 278                 .proc_handler = &proc_dointvec
 279         },
 280         {
 281                 INIT_CTL_NAME
 282                 .procname = "max_immediate",
 283                 .data     = &max_immediate,
 284                 .maxlen   = sizeof(int),
 285                 .mode     = 0444,
 286                 .proc_handler = &proc_dointvec
 287         },
 288         {
 289                 INIT_CTL_NAME
 290                 .procname = "checksum",
 291                 .data     = &checksum,
 292                 .maxlen   = sizeof(int),
 293                 .mode     = 0644,
 294                 .proc_handler = &proc_dointvec
 295         },
 296         {
 297                 INIT_CTL_NAME
 298                 .procname = "bte_dlvr_mode",
 299                 .data     = &bte_dlvr_mode,
 300                 .maxlen   = sizeof(int),
 301                 .mode     = 0644,
 302                 .proc_handler = &proc_dointvec
 303         },
 304         {
 305                 INIT_CTL_NAME
 306                 .procname = "ptag",
 307                 .data     = &ptag,
 308                 .maxlen   = sizeof(int),
 309                 .mode     = 0444,
 310                 .proc_handler = &proc_dointvec
 311         },
 312         {
 313                 INIT_CTL_NAME
 314                 .procname = "nwildcard",
 315                 .data     = &nwildcard,
 316                 .maxlen   = sizeof(int),
 317                 .mode     = 0444,
 318                 .proc_handler = &proc_dointvec
 319         },
 320         {
 321                 INIT_CTL_NAME
 322                 .procname = "bte_relaxed_ordering",
 323                 .data     = &bte_relaxed_ordering,
 324                 .maxlen   = sizeof(int),
 325                 .mode     = 0644,
 326                 .proc_handler = &proc_dointvec
 327         },
 328         {
 329                 INIT_CTL_NAME
 330                 .procname = "checksum_dump",
 331                 .data     = &checksum_dump,
 332                 .maxlen   = sizeof(int),
 333                 .mode     = 0644,
 334                 .proc_handler = &proc_dointvec
 335         },
 336         {
 337                 INIT_CTL_NAME
 338                 .procname = "nice",
 339                 .data     = &nice,
 340                 .maxlen   = sizeof(int),
 341                 .mode     = 0444,
 342                 .proc_handler = &proc_dointvec
 343         },
 344         {
 345                 INIT_CTL_NAME
 346                 .procname = "rdmaq_intervals",
 347                 .data     = &rdmaq_intervals,
 348                 .maxlen   = sizeof(int),
 349                 .mode     = 0644,
 350                 .proc_handler = &proc_dointvec
 351         },
 352         {
 353                 INIT_CTL_NAME
 354                 .procname = "loops",
 355                 .data     = &loops,
 356                 .maxlen   = sizeof(int),
 357                 .mode     = 0644,
 358                 .proc_handler = &proc_dointvec
 359         },
 360         {
 361                 INIT_CTL_NAME
 362                 .procname = "hash_size",
 363                 .data     = &hash_size,
 364                 .maxlen   = sizeof(int),
 365                 .mode     = 0444,
 366                 .proc_handler = &proc_dointvec
 367         },
 368         {
 369                 INIT_CTL_NAME
 370                 .procname = "peer_health",
 371                 .data     = &peer_health,
 372                 .maxlen   = sizeof(int),
 373                 .mode     = 0444,
 374                 .proc_handler = &proc_dointvec
 375         },
 376         {
 377                 INIT_CTL_NAME
 378                 .procname = "vmap_cksum",
 379                 .data     = &vmap_cksum,
 380                 .maxlen   = sizeof(int),
 381                 .mode     = 0644,
 382                 .proc_handler = &proc_dointvec
 383         },
 384         {
 385                 INIT_CTL_NAME
 386                 .procname = "mbox_per_block",
 387                 .data     = &mbox_per_block,
 388                 .maxlen   = sizeof(int),
 389                 .mode     = 0644,
 390                 .proc_handler = &proc_dointvec
 391         },
 392         {
 393                 INIT_CTL_NAME
 394                 .procname = "mbox_credits"
 395                 .data     = &mbox_credits,
 396                 .maxlen   = sizeof(int),
 397                 .mode     = 0644,
 398                 .proc_handler = &proc_dointvec
 399         },
 400         {
 401                 INIT_CTL_NAME
 402                 .procname = "sched_threads"
 403                 .data     = &sched_threads,
 404                 .maxlen   = sizeof(int),
 405                 .mode     = 0444,
 406                 .proc_handler = &proc_dointvec
 407         },
 408         {
 409                 INIT_CTL_NAME
 410                 .procname = "net_hash_size",
 411                 .data     = &net_hash_size,
 412                 .maxlen   = sizeof(int),
 413                 .mode     = 0444,
 414                 .proc_handler = &proc_dointvec
 415         },
 416         {
 417                 INIT_CTL_NAME
 418                 .procname = "hardware_timeout",
 419                 .data     = &hardware_timeout,
 420                 .maxlen   = sizeof(int),
 421                 .mode     = 0444,
 422                 .proc_handler = &proc_dointvec
 423         },
 424         {
 425                 INIT_CTL_NAME
 426                 .procname = "mdd_timeout",
 427                 .data     = &mdd_timeout,
 428                 .maxlen   = sizeof(int),
 429                 .mode     = 0644,
 430                 .proc_handler = &proc_dointvec
 431         },
 432         {
 433                 INIT_CTL_NAME
 434                 .procname = "max_retransmits"
 435                 .data     = &max_retransmits,
 436                 .maxlen   = sizeof(int),
 437                 .mode     = 0444,
 438                 .proc_handler = &proc_dointvec
 439         },
 440         {
 441                 INIT_CTL_NAME
 442                 .procname = "concurrent_sends",
 443                 .data     = &concurrent_sends,
 444                 .maxlen   = sizeof(int),
 445                 .mode     = 0444,
 446                 .proc_handler = &proc_dointvec
 447         },
 448         {
 449                 INIT_CTL_NAME
 450                 .procname = "nphys_mbox",
 451                 .data     = &nphys_mbox,
 452                 .maxlen   = sizeof(int),
 453                 .mode     = 0444,
 454                 .proc_handler = &proc_dointvec
 455         },
 456         {
 457                 INIT_CTL_NAME
 458                 .procname = "sched_timeout",
 459                 .data     = &sched_timeout,
 460                 .maxlen   = sizeof(int),
 461                 .mode     = 0644,
 462                 .proc_handler = &proc_dointvec
 463         },
 464         {
 465                 INIT_CTL_NAME
 466                 .procname = "sched_nice",
 467                 .data     = &sched_nice,
 468                 .maxlen   = sizeof(int),
 469                 .mode     = 0444,
 470                 .proc_handler = &proc_dointvec
 471         },
 472         {
 473                 INIT_CTL_NAME
 474                 .procname = "reverse_rdma",
 475                 .data     = &reverse_rdma,
 476                 .maxlen   = sizeof(int),
 477                 .mode     = 0644,
 478                 .proc_handler = &proc_dointvec
 479         },
 480                 INIT_CTL_NAME
 481                 .procname = "dgram_timeout"
 482                 .data     = &dgram_timeout,
 483                 .maxlen   = sizeof(int),
 484                 .mode     = 0644,
 485                 .proc_handler = &proc_dointvec
 486         },
 487         {
 488                 INIT_CTL_NAME
 489                 .procname = "peer_timeout"
 490                 .data     = &peer_timeout,
 491                 .maxlen   = sizeof(int),
 492                 .mode     = 0444,
 493                 .proc_handler = &proc_dointvec
 494         },
 495         {
 496                 INIT_CTL_NAME
 497                 .procname = "eager_credits",
 498                 .data     = &eager_credits,
 499                 .maxlen   = sizeof(int),
 500                 .mode     = 0644,
 501                 .proc_handler = &proc_dointvec
 502         },
 503         {
 504                 INIT_CTL_NAME
 505                 .procname = "efault_lbug"
 506                 .data     = &efault_lbug,
 507                 .maxlen   = sizeof(int),
 508                 .mode     = 0644,
 509                 .proc_handler = &proc_dointvec
 510         },
 511         {
 512                 INIT_CTL_NAME
 513                 .procname = "max_conn_purg"
 514                 .data     = &max_conn_purg,
 515                 .maxlen   = sizeof(int),
 516                 .mode     = 0644,
 517                 .proc_handler = &proc_dointvec
 518         },
 519         { 0 }
 520 };
 521
 522 static struct ctl_table kgnilnd_top_ctl_table[] = {
 523         {
 524                 INIT_CTL_NAME
 525                 .procname = "gnilnd",
 526                 .data     = NULL,
 527                 .maxlen   = 0,
 528                 .mode     = 0555,
 529                 .child    = kgnilnd_ctl_table
 530         },
 531         { 0 }
 532 };
 533 #endif
 534
 535 int
 536 kgnilnd_tunables_init()
 537 {
 538         int rc = 0;
 539
 540 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 541         kgnilnd_tunables.kgn_sysctl =
 542                 cfs_register_sysctl_table(kgnilnd_top_ctl_table, 0);
 543
 544         if (kgnilnd_tunables.kgn_sysctl == NULL)
 545                 CWARN("Can't setup /proc tunables\n");
 546 #endif
 547         switch (*kgnilnd_tunables.kgn_checksum) {
 548         default:
 549                 CERROR("Invalid checksum module parameter: %d\n",
 550                        *kgnilnd_tunables.kgn_checksum);
 551                 rc = -EINVAL;
 552                 GOTO(out, rc);
 553         case GNILND_CHECKSUM_OFF:
 554                 /* no checksumming */
 555                 break;
 556         case GNILND_CHECKSUM_SMSG_HEADER:
 557                 LCONSOLE_INFO("SMSG header only checksumming enabled\n");
 558                 break;
 559         case GNILND_CHECKSUM_SMSG:
 560                 LCONSOLE_INFO("SMSG checksumming enabled\n");
 561                 break;
 562         case GNILND_CHECKSUM_SMSG_BTE:
 563                 LCONSOLE_INFO("SMSG + BTE checksumming enabled\n");
 564                 break;
 565         }
 566
 567         if (*kgnilnd_tunables.kgn_max_immediate > GNILND_MAX_IMMEDIATE) {
 568                 LCONSOLE_ERROR("kgnilnd module parameter 'max_immediate' too large %d > %d\n",
 569                 *kgnilnd_tunables.kgn_max_immediate, GNILND_MAX_IMMEDIATE);
 570                 rc = -EINVAL;
 571                 GOTO(out, rc);
 572         }
 573
 574         if (*kgnilnd_tunables.kgn_mbox_per_block < 1) {
 575                 *kgnilnd_tunables.kgn_mbox_per_block = 1;
 576         }
 577
 578         if (*kgnilnd_tunables.kgn_concurrent_sends == 0) {
 579                 *kgnilnd_tunables.kgn_concurrent_sends = *kgnilnd_tunables.kgn_peer_credits;
 580         } else if (*kgnilnd_tunables.kgn_concurrent_sends > *kgnilnd_tunables.kgn_peer_credits) {
 581                 LCONSOLE_ERROR("kgnilnd parameter 'concurrent_sends' too large: %d > %d (peer_credits)\n",
 582                                *kgnilnd_tunables.kgn_concurrent_sends, *kgnilnd_tunables.kgn_peer_credits);
 583                 rc = -EINVAL;
 584         }
 585 out:
 586         return rc;
 587 }
 588
 589 void
 590 kgnilnd_tunables_fini()
 591 {
 592 #if CONFIG_SYSCTL && !CFS_SYSFS_MODULE_PARM
 593         if (kgnilnd_tunables.kgn_sysctl != NULL)
 594                 cfs_unregister_sysctl_table(kgnilnd_tunables.kgn_sysctl);
 595 #endif
 596 }