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  1. $ modinfo zfs
  2. filename: /lib/modules/5.6.0/kernel/zfs/zfs.ko
  3. version: 0.8.3-1ubuntu1
  4. license: CDDL
  5. author: OpenZFS on Linux
  6. description: ZFS
  7. alias: devname:zfs
  8. alias: char-major-10-249
  9. srcversion: B8EB13E4A2D019D0938B6DA
  10. depends: spl,znvpair,icp,zlua,zunicode,zcommon,zavl
  11. retpoline: Y
  12. name: zfs
  13. vermagic: 5.6.0 SMP mod_unload modversions
  14. sig_id: PKCS#7
  15. signer: Build time autogenerated kernel key
  16. sig_key: 7B:B2:30:3B:01:57:9C:EF:49:4D:E5:75:6E:9C:3A:C5:DE:6E:18:C3
  17. sig_hashalgo: sha512
  18. signature: 21:27:76:B8:A0:D2:3F:4B:0B:AA:3E:63:06:56:27:7F:AE:B6:17:D5:
  19. 0B:DE:8A:90:81:8F:34:C1:AD:A0:34:70:95:EA:25:D4:81:72:85:09:
  20. A6:D7:27:AB:60:D1:D1:C5:51:D9:59:D0:FD:9D:7D:A3:90:E2:00:CE:
  21. 8D:96:6A:1B:C5:F2:E6:82:BE:9E:79:79:94:22:D4:2B:98:4B:98:23:
  22. 29:56:A5:12:A6:B5:D1:0A:2E:BC:A0:51:C0:EC:13:F6:A9:5A:99:E3:
  23. FC:D4:70:50:90:D0:A1:EF:65:CB:47:EB:2A:6D:C8:CE:ED:AB:E1:AB:
  24. 29:59:10:18:62:A2:E7:70:7F:0D:2F:C5:62:0F:89:AC:77:31:6C:4D:
  25. AE:BC:B3:57:90:E4:03:67:63:C9:22:FE:96:FE:60:79:68:FC:1F:7F:
  26. E0:CC:81:E0:61:B5:8A:6C:08:CF:60:C0:2B:94:41:99:66:1B:BF:77:
  27. 1B:A2:53:8B:EC:A7:82:85:47:EF:33:5F:08:92:81:6F:CA:16:AE:B7:
  28. 6F:3F:90:AA:18:19:5F:7A:0B:D3:2E:C9:63:B6:1D:FA:5A:3B:8B:A2:
  29. B5:34:F9:78:9B:64:FA:AD:F2:63:F4:A8:96:DE:F2:6F:07:75:A1:96:
  30. 9C:8A:2E:AD:E9:F5:B3:E9:4B:9F:DF:BF:11:CD:9A:BA:B0:09:FC:48:
  31. 1A:D4:A1:C8:C4:A7:86:B8:DC:15:D3:18:95:F9:8F:6F:A1:F2:DA:AA:
  32. 96:67:A5:41:61:8C:EB:B6:B6:F2:AA:68:DF:0D:45:F4:29:40:31:82:
  33. FF:32:63:34:67:7D:FE:7C:DB:53:E3:8D:56:B5:25:34:13:95:CE:4E:
  34. DC:BE:83:58:40:26:A1:A9:BF:EA:01:34:58:A9:A2:C2:6D:8D:E3:04:
  35. DD:9D:2A:F9:C5:55:12:6C:C1:61:16:97:DD:51:82:E8:9D:E7:5A:8A:
  36. 2B:30:F0:C3:E2:95:E5:60:B1:5B:3B:DD:EC:1E:6F:6D:90:55:1F:99:
  37. CF:58:65:E5:E4:83:22:EB:21:8D:44:90:D1:4F:CC:70:F1:A9:16:5F:
  38. 53:CD:DA:0F:50:96:2D:9D:0A:8A:D1:64:28:83:FE:72:9F:5B:77:4B:
  39. 33:09:5D:F9:1F:29:FE:45:1C:FB:47:99:41:1D:78:48:9D:8D:2F:D7:
  40. 4F:19:8C:1B:29:00:1C:1E:42:0C:FC:0E:88:BC:1B:9A:8E:3D:60:D2:
  41. 92:F5:F9:43:D5:26:4E:A8:66:69:AB:06:1E:0B:D1:A8:3E:A0:99:C2:
  42. 14:EE:20:F6:0D:0C:CF:3E:08:4C:3A:EC:CE:79:77:FC:CD:67:B0:64:
  43. F1:6F:1B:14:76:7E:F5:0D:EF:64:3D:37
  44. parm: zvol_inhibit_dev:Do not create zvol device nodes (uint)
  45. parm: zvol_major:Major number for zvol device (uint)
  46. parm: zvol_threads:Max number of threads to handle I/O requests (uint)
  47. parm: zvol_request_sync:Synchronously handle bio requests (uint)
  48. parm: zvol_max_discard_blocks:Max number of blocks to discard (ulong)
  49. parm: zvol_prefetch_bytes:Prefetch N bytes at zvol start+end (uint)
  50. parm: zvol_volmode:Default volmode property value (uint)
  51. parm: zfs_key_max_salt_uses:Max number of times a salt value can be used for generating encryption keys before it is rotated (ulong)
  52. parm: zio_slow_io_ms:Max I/O completion time (milliseconds) before marking it as slow (int)
  53. parm: zio_requeue_io_start_cut_in_line:Prioritize requeued I/O (int)
  54. parm: zfs_sync_pass_deferred_free:Defer frees starting in this pass (int)
  55. parm: zfs_sync_pass_dont_compress:Don't compress starting in this pass (int)
  56. parm: zfs_sync_pass_rewrite:Rewrite new bps starting in this pass (int)
  57. parm: zio_dva_throttle_enabled:Throttle block allocations in the ZIO pipeline (int)
  58. parm: zio_deadman_log_all:Log all slow ZIOs, not just those with vdevs (int)
  59. parm: zfs_commit_timeout_pct:ZIL block open timeout percentage (int)
  60. parm: zil_replay_disable:Disable intent logging replay (int)
  61. parm: zil_nocacheflush:Disable ZIL cache flushes (int)
  62. parm: zil_slog_bulk:Limit in bytes slog sync writes per commit (ulong)
  63. parm: zil_maxblocksize:Limit in bytes of ZIL log block size (int)
  64. parm: zfs_object_mutex_size:Size of znode hold array (uint)
  65. parm: zfs_unlink_suspend_progress:Set to prevent async unlinks (debug - leaks space into the unlinked set) (int)
  66. parm: zfs_delete_blocks:Delete files larger than N blocks async (ulong)
  67. parm: zfs_read_chunk_size:Bytes to read per chunk (ulong)
  68. parm: zfs_immediate_write_sz:Largest data block to write to zil (long)
  69. parm: zfs_dbgmsg_enable:Enable ZFS debug message log (int)
  70. parm: zfs_dbgmsg_maxsize:Maximum ZFS debug log size (int)
  71. parm: zfs_admin_snapshot:Enable mkdir/rmdir/mv in .zfs/snapshot (int)
  72. parm: zfs_expire_snapshot:Seconds to expire .zfs/snapshot (int)
  73. parm: zfs_lua_max_instrlimit:Max instruction limit that can be specified for a channel program (ulong)
  74. parm: zfs_lua_max_memlimit:Max memory limit that can be specified for a channel program (ulong)
  75. parm: zap_iterate_prefetch:When iterating ZAP object, prefetch it (int)
  76. parm: zfs_trim_extent_bytes_max:Max size of TRIM commands, larger will be split (uint)
  77. parm: zfs_trim_extent_bytes_min:Min size of TRIM commands, smaller will be skipped (uint)
  78. parm: zfs_trim_metaslab_skip:Skip metaslabs which have never been initialized (uint)
  79. parm: zfs_trim_txg_batch:Min number of txgs to aggregate frees before issuing TRIM (uint)
  80. parm: zfs_trim_queue_limit:Max queued TRIMs outstanding per leaf vdev (uint)
  81. parm: zfs_removal_ignore_errors:Ignore hard IO errors when removing device (int)
  82. parm: zfs_remove_max_segment:Largest contiguous segment to allocate when removing device (int)
  83. parm: vdev_removal_max_span:Largest span of free chunks a remap segment can span (int)
  84. parm: zfs_removal_suspend_progress:Pause device removal after this many bytes are copied (debug use only - causes removal to hang) (int)
  85. parm: zfs_vdev_raidz_impl:Select raidz implementation.
  86. parm: zfs_vdev_aggregation_limit:Max vdev I/O aggregation size (int)
  87. parm: zfs_vdev_aggregation_limit_non_rotating:Max vdev I/O aggregation size for non-rotating media (int)
  88. parm: zfs_vdev_aggregate_trim:Allow TRIM I/O to be aggregated (int)
  89. parm: zfs_vdev_read_gap_limit:Aggregate read I/O over gap (int)
  90. parm: zfs_vdev_write_gap_limit:Aggregate write I/O over gap (int)
  91. parm: zfs_vdev_max_active:Maximum number of active I/Os per vdev (int)
  92. parm: zfs_vdev_async_write_active_max_dirty_percent:Async write concurrency max threshold (int)
  93. parm: zfs_vdev_async_write_active_min_dirty_percent:Async write concurrency min threshold (int)
  94. parm: zfs_vdev_async_read_max_active:Max active async read I/Os per vdev (int)
  95. parm: zfs_vdev_async_read_min_active:Min active async read I/Os per vdev (int)
  96. parm: zfs_vdev_async_write_max_active:Max active async write I/Os per vdev (int)
  97. parm: zfs_vdev_async_write_min_active:Min active async write I/Os per vdev (int)
  98. parm: zfs_vdev_initializing_max_active:Max active initializing I/Os per vdev (int)
  99. parm: zfs_vdev_initializing_min_active:Min active initializing I/Os per vdev (int)
  100. parm: zfs_vdev_removal_max_active:Max active removal I/Os per vdev (int)
  101. parm: zfs_vdev_removal_min_active:Min active removal I/Os per vdev (int)
  102. parm: zfs_vdev_scrub_max_active:Max active scrub I/Os per vdev (int)
  103. parm: zfs_vdev_scrub_min_active:Min active scrub I/Os per vdev (int)
  104. parm: zfs_vdev_sync_read_max_active:Max active sync read I/Os per vdev (int)
  105. parm: zfs_vdev_sync_read_min_active:Min active sync read I/Os per vdev (int)
  106. parm: zfs_vdev_sync_write_max_active:Max active sync write I/Os per vdev (int)
  107. parm: zfs_vdev_sync_write_min_active:Min active sync write I/Os per vdev (int)
  108. parm: zfs_vdev_trim_max_active:Max active trim/discard I/Os per vdev (int)
  109. parm: zfs_vdev_trim_min_active:Min active trim/discard I/Os per vdev (int)
  110. parm: zfs_vdev_queue_depth_pct:Queue depth percentage for each top-level vdev (int)
  111. parm: zfs_vdev_mirror_rotating_inc:Rotating media load increment for non-seeking I/O's (int)
  112. parm: zfs_vdev_mirror_rotating_seek_inc:Rotating media load increment for seeking I/O's (int)
  113. parm: zfs_vdev_mirror_rotating_seek_offset:Offset in bytes from the last I/O which triggers a reduced rotating media seek increment (int)
  114. parm: zfs_vdev_mirror_non_rotating_inc:Non-rotating media load increment for non-seeking I/O's (int)
  115. parm: zfs_vdev_mirror_non_rotating_seek_inc:Non-rotating media load increment for seeking I/O's (int)
  116. parm: zfs_initialize_value:Value written during zpool initialize (ulong)
  117. parm: zfs_condense_indirect_vdevs_enable:Whether to attempt condensing indirect vdev mappings (int)
  118. parm: zfs_condense_min_mapping_bytes:Minimum size of vdev mapping to condense (ulong)
  119. parm: zfs_condense_max_obsolete_bytes:Minimum size obsolete spacemap to attempt condensing (ulong)
  120. parm: zfs_condense_indirect_commit_entry_delay_ms:Delay while condensing vdev mapping (int)
  121. parm: zfs_reconstruct_indirect_combinations_max:Maximum number of combinations when reconstructing split segments (int)
  122. parm: zfs_vdev_scheduler:I/O scheduler
  123. parm: zfs_vdev_cache_max:Inflate reads small than max (int)
  124. parm: zfs_vdev_cache_size:Total size of the per-disk cache (int)
  125. parm: zfs_vdev_cache_bshift:Shift size to inflate reads too (int)
  126. parm: zfs_vdev_default_ms_count:Target number of metaslabs per top-level vdev (int)
  127. parm: zfs_vdev_min_ms_count:Minimum number of metaslabs per top-level vdev (int)
  128. parm: zfs_vdev_ms_count_limit:Practical upper limit of total metaslabs per top-level vdev (int)
  129. parm: zfs_slow_io_events_per_second:Rate limit slow IO (delay) events to this many per second (uint)
  130. parm: zfs_checksum_events_per_second:Rate limit checksum events to this many checksum errors per second (do not set below zedthreshold). (uint)
  131. parm: zfs_scan_ignore_errors:Ignore errors during resilver/scrub (int)
  132. parm: vdev_validate_skip:Bypass vdev_validate() (int)
  133. parm: zfs_nocacheflush:Disable cache flushes (int)
  134. parm: zfs_txg_timeout:Max seconds worth of delta per txg (int)
  135. parm: zfs_read_history:Historical statistics for the last N reads (int)
  136. parm: zfs_read_history_hits:Include cache hits in read history (int)
  137. parm: zfs_txg_history:Historical statistics for the last N txgs (int)
  138. parm: zfs_multihost_history:Historical statistics for last N multihost writes (int)
  139. parm: zfs_flags:Set additional debugging flags (uint)
  140. parm: zfs_recover:Set to attempt to recover from fatal errors (int)
  141. parm: zfs_free_leak_on_eio:Set to ignore IO errors during free and permanently leak the space (int)
  142. parm: zfs_deadman_synctime_ms:Pool sync expiration time in milliseconds
  143. parm: zfs_deadman_ziotime_ms:IO expiration time in milliseconds
  144. parm: zfs_deadman_checktime_ms:Dead I/O check interval in milliseconds (ulong)
  145. parm: zfs_deadman_enabled:Enable deadman timer (int)
  146. parm: zfs_deadman_failmode:Failmode for deadman timer
  147. parm: spa_asize_inflation:SPA size estimate multiplication factor (int)
  148. parm: spa_slop_shift:Reserved free space in pool
  149. parm: zfs_ddt_data_is_special:Place DDT data into the special class (int)
  150. parm: zfs_user_indirect_is_special:Place user data indirect blocks into the special class (int)
  151. parm: zfs_special_class_metadata_reserve_pct:Small file blocks in special vdevs depends on this much free space available (int)
  152. parm: spa_config_path:SPA config file (/etc/zfs/zpool.cache) (charp)
  153. parm: zfs_autoimport_disable:Disable pool import at module load (int)
  154. parm: zfs_spa_discard_memory_limit:Maximum memory for prefetching checkpoint space map per top-level vdev while discarding checkpoint (ulong)
  155. parm: spa_load_verify_shift:log2(fraction of arc that can be used by inflight I/Os when verifying pool during import (int)
  156. parm: spa_load_verify_metadata:Set to traverse metadata on pool import (int)
  157. parm: spa_load_verify_data:Set to traverse data on pool import (int)
  158. parm: spa_load_print_vdev_tree:Print vdev tree to zfs_dbgmsg during pool import (int)
  159. parm: zio_taskq_batch_pct:Percentage of CPUs to run an IO worker thread (uint)
  160. parm: zfs_max_missing_tvds:Allow importing pool with up to this number of missing top-level vdevs (in read-only mode) (ulong)
  161. parm: zfs_multilist_num_sublists:Number of sublists used in each multilist (int)
  162. parm: zfs_multihost_fail_intervals:Max allowed period without a successful mmp write (uint)
  163. parm: zfs_multihost_interval:Milliseconds between mmp writes to each leaf
  164. parm: zfs_multihost_import_intervals:Number of zfs_multihost_interval periods to wait for activity (uint)
  165. parm: metaslab_aliquot:allocation granularity (a.k.a. stripe size) (ulong)
  166. parm: metaslab_debug_load:load all metaslabs when pool is first opened (int)
  167. parm: metaslab_debug_unload:prevent metaslabs from being unloaded (int)
  168. parm: metaslab_preload_enabled:preload potential metaslabs during reassessment (int)
  169. parm: zfs_mg_noalloc_threshold:percentage of free space for metaslab group to allow allocation (int)
  170. parm: zfs_mg_fragmentation_threshold:fragmentation for metaslab group to allow allocation (int)
  171. parm: zfs_metaslab_fragmentation_threshold:fragmentation for metaslab to allow allocation (int)
  172. parm: metaslab_fragmentation_factor_enabled:use the fragmentation metric to prefer less fragmented metaslabs (int)
  173. parm: metaslab_lba_weighting_enabled:prefer metaslabs with lower LBAs (int)
  174. parm: metaslab_bias_enabled:enable metaslab group biasing (int)
  175. parm: zfs_metaslab_segment_weight_enabled:enable segment-based metaslab selection (int)
  176. parm: zfs_metaslab_switch_threshold:segment-based metaslab selection maximum buckets before switching (int)
  177. parm: metaslab_force_ganging:blocks larger than this size are forced to be gang blocks (ulong)
  178. parm: metaslab_df_max_search:max distance (bytes) to search forward before using size tree (int)
  179. parm: metaslab_df_use_largest_segment:when looking in size tree, use largest segment instead of exact fit (int)
  180. parm: zfs_zevent_len_max:Max event queue length (int)
  181. parm: zfs_zevent_cols:Max event column width (int)
  182. parm: zfs_zevent_console:Log events to the console (int)
  183. parm: zfs_scan_vdev_limit:Max bytes in flight per leaf vdev for scrubs and resilvers (ulong)
  184. parm: zfs_scrub_min_time_ms:Min millisecs to scrub per txg (int)
  185. parm: zfs_obsolete_min_time_ms:Min millisecs to obsolete per txg (int)
  186. parm: zfs_free_min_time_ms:Min millisecs to free per txg (int)
  187. parm: zfs_resilver_min_time_ms:Min millisecs to resilver per txg (int)
  188. parm: zfs_scan_suspend_progress:Set to prevent scans from progressing (int)
  189. parm: zfs_no_scrub_io:Set to disable scrub I/O (int)
  190. parm: zfs_no_scrub_prefetch:Set to disable scrub prefetching (int)
  191. parm: zfs_async_block_max_blocks:Max number of blocks freed in one txg (ulong)
  192. parm: zfs_free_bpobj_enabled:Enable processing of the free_bpobj (int)
  193. parm: zfs_scan_mem_lim_fact:Fraction of RAM for scan hard limit (int)
  194. parm: zfs_scan_issue_strategy:IO issuing strategy during scrubbing. 0 = default, 1 = LBA, 2 = size (int)
  195. parm: zfs_scan_legacy:Scrub using legacy non-sequential method (int)
  196. parm: zfs_scan_checkpoint_intval:Scan progress on-disk checkpointing interval (int)
  197. parm: zfs_scan_max_ext_gap:Max gap in bytes between sequential scrub / resilver I/Os (ulong)
  198. parm: zfs_scan_mem_lim_soft_fact:Fraction of hard limit used as soft limit (int)
  199. parm: zfs_scan_strict_mem_lim:Tunable to attempt to reduce lock contention (int)
  200. parm: zfs_scan_fill_weight:Tunable to adjust bias towards more filled segments during scans (int)
  201. parm: zfs_resilver_disable_defer:Process all resilvers immediately (int)
  202. parm: zfs_dirty_data_max_percent:percent of ram can be dirty (int)
  203. parm: zfs_dirty_data_max_max_percent:zfs_dirty_data_max upper bound as % of RAM (int)
  204. parm: zfs_delay_min_dirty_percent:transaction delay threshold (int)
  205. parm: zfs_dirty_data_max:determines the dirty space limit (ulong)
  206. parm: zfs_dirty_data_max_max:zfs_dirty_data_max upper bound in bytes (ulong)
  207. parm: zfs_dirty_data_sync_percent:dirty data txg sync threshold as a percentage of zfs_dirty_data_max (int)
  208. parm: zfs_delay_scale:how quickly delay approaches infinity (ulong)
  209. parm: zfs_sync_taskq_batch_pct:max percent of CPUs that are used to sync dirty data (int)
  210. parm: zfs_zil_clean_taskq_nthr_pct:max percent of CPUs that are used per dp_sync_taskq (int)
  211. parm: zfs_zil_clean_taskq_minalloc:number of taskq entries that are pre-populated (int)
  212. parm: zfs_zil_clean_taskq_maxalloc:max number of taskq entries that are cached (int)
  213. parm: zfs_disable_ivset_guid_check:Set to allow raw receives without IVset guids (int)
  214. parm: zfs_max_recordsize:Max allowed record size (int)
  215. parm: zfs_prefetch_disable:Disable all ZFS prefetching (int)
  216. parm: zfetch_max_streams:Max number of streams per zfetch (uint)
  217. parm: zfetch_min_sec_reap:Min time before stream reclaim (uint)
  218. parm: zfetch_max_distance:Max bytes to prefetch per stream (default 8MB) (uint)
  219. parm: zfetch_array_rd_sz:Number of bytes in a array_read (ulong)
  220. parm: zfs_pd_bytes_max:Max number of bytes to prefetch (int)
  221. parm: ignore_hole_birth:Alias for send_holes_without_birth_time (int)
  222. parm: send_holes_without_birth_time:Ignore hole_birth txg for zfs send (int)
  223. parm: zfs_override_estimate_recordsize:Record size calculation override for zfs send estimates (ulong)
  224. parm: zfs_send_corrupt_data:Allow sending corrupt data (int)
  225. parm: zfs_send_queue_length:Maximum send queue length (int)
  226. parm: zfs_send_unmodified_spill_blocks:Send unmodified spill blocks (int)
  227. parm: zfs_recv_queue_length:Maximum receive queue length (int)
  228. parm: dmu_object_alloc_chunk_shift:CPU-specific allocator grabs 2^N objects at once (int)
  229. parm: zfs_nopwrite_enabled:Enable NOP writes (int)
  230. parm: zfs_per_txg_dirty_frees_percent:percentage of dirtied blocks from frees in one TXG (ulong)
  231. parm: zfs_dmu_offset_next_sync:Enable forcing txg sync to find holes (int)
  232. parm: dmu_prefetch_max:Limit one prefetch call to this size (int)
  233. parm: zfs_dedup_prefetch:Enable prefetching dedup-ed blks (int)
  234. parm: zfs_dbuf_state_index:Calculate arc header index (int)
  235. parm: dbuf_cache_max_bytes:Maximum size in bytes of the dbuf cache. (ulong)
  236. parm: dbuf_cache_hiwater_pct:Percentage over dbuf_cache_max_bytes when dbufs must be evicted directly. (uint)
  237. parm: dbuf_cache_lowater_pct:Percentage below dbuf_cache_max_bytes when the evict thread stops evicting dbufs. (uint)
  238. parm: dbuf_metadata_cache_max_bytes:Maximum size in bytes of the dbuf metadata cache. (ulong)
  239. parm: dbuf_metadata_cache_shift:int
  240. parm: dbuf_cache_shift:Set the size of the dbuf cache to a log2 fraction of arc size. (int)
  241. parm: zfs_arc_min:Min arc size
  242. parm: zfs_arc_max:Max arc size
  243. parm: zfs_arc_meta_limit:Meta limit for arc size
  244. parm: zfs_arc_meta_limit_percent:Percent of arc size for arc meta limit
  245. parm: zfs_arc_meta_min:Min arc metadata
  246. parm: zfs_arc_meta_prune:Meta objects to scan for prune (int)
  247. parm: zfs_arc_meta_adjust_restarts:Limit number of restarts in arc_adjust_meta (int)
  248. parm: zfs_arc_meta_strategy:Meta reclaim strategy (int)
  249. parm: zfs_arc_grow_retry:Seconds before growing arc size
  250. parm: zfs_arc_p_dampener_disable:disable arc_p adapt dampener (int)
  251. parm: zfs_arc_shrink_shift:log2(fraction of arc to reclaim)
  252. parm: zfs_arc_pc_percent:Percent of pagecache to reclaim arc to (uint)
  253. parm: zfs_arc_p_min_shift:arc_c shift to calc min/max arc_p
  254. parm: zfs_arc_average_blocksize:Target average block size (int)
  255. parm: zfs_compressed_arc_enabled:Disable compressed arc buffers (int)
  256. parm: zfs_arc_min_prefetch_ms:Min life of prefetch block in ms
  257. parm: zfs_arc_min_prescient_prefetch_ms:Min life of prescient prefetched block in ms (int)
  258. parm: l2arc_write_max:Max write bytes per interval (ulong)
  259. parm: l2arc_write_boost:Extra write bytes during device warmup (ulong)
  260. parm: l2arc_headroom:Number of max device writes to precache (ulong)
  261. parm: l2arc_headroom_boost:Compressed l2arc_headroom multiplier (ulong)
  262. parm: l2arc_feed_secs:Seconds between L2ARC writing (ulong)
  263. parm: l2arc_feed_min_ms:Min feed interval in milliseconds (ulong)
  264. parm: l2arc_noprefetch:Skip caching prefetched buffers (int)
  265. parm: l2arc_feed_again:Turbo L2ARC warmup (int)
  266. parm: l2arc_norw:No reads during writes (int)
  267. parm: zfs_arc_lotsfree_percent:System free memory I/O throttle in bytes
  268. parm: zfs_arc_sys_free:System free memory target size in bytes
  269. parm: zfs_arc_dnode_limit:Minimum bytes of dnodes in arc
  270. parm: zfs_arc_dnode_limit_percent:Percent of ARC meta buffers for dnodes (ulong)
  271. parm: zfs_arc_dnode_reduce_percent:Percentage of excess dnodes to try to unpin (ulong)
  272. parm: zfs_abd_scatter_enabled:Toggle whether ABD allocations must be linear. (int)
  273. parm: zfs_abd_scatter_min_size:Minimum size of scatter allocations. (int)
  274. parm: zfs_abd_scatter_max_order:Maximum order allocation used for a scatter ABD. (uint)
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