Running `::zfs_params` on a semi-recent Illumos build (8a051e3a96) produces the 
following warning:

```
mdb: variable zfetch_block_cap not found: unknown symbol name
```

Full output:

```
loli@openindiana:~$ uname -a
SunOS openindiana 5.11 master-0-g8a051e3a96 i86pc i386 i86pc
loli@openindiana:~$ sudo mdb -ke ::zfs_params
arc_reduce_dnlc_percent = 0x3
arc_lotsfree_percent = 0xa
zfs_dirty_data_max = 0x256c1e66
zfs_dirty_data_sync = 0x4000000
zfs_delay_max_ns = 0x5f5e100
zfs_delay_min_dirty_percent = 0x3c
zfs_delay_scale = 0x7a120
zfs_vdev_max_active = 0x3e8
zfs_vdev_sync_read_min_active = 0xa
zfs_vdev_sync_read_max_active = 0xa
zfs_vdev_sync_write_min_active = 0xa
zfs_vdev_sync_write_max_active = 0xa
zfs_vdev_async_read_min_active = 0x1
zfs_vdev_async_read_max_active = 0x3
zfs_vdev_async_write_min_active = 0x1
zfs_vdev_async_write_max_active = 0xa
zfs_vdev_scrub_min_active = 0x1
zfs_vdev_scrub_max_active = 0x2
zfs_vdev_async_write_active_min_dirty_percent = 0x1e
zfs_vdev_async_write_active_max_dirty_percent = 0x3c
spa_asize_inflation = 0x18
zfs_arc_max = 0x0
zfs_arc_min = 0x0
arc_shrink_shift = 0x7
zfs_mdcomp_disable = 0x0
zfs_prefetch_disable = 0x0
zfetch_max_streams = 0x8
zfetch_min_sec_reap = 0x2
mdb: variable zfetch_block_cap not found: unknown symbol name
zfetch_array_rd_sz = 0x100000
zfs_default_bs = 0x9
zfs_default_ibs = 0x11
metaslab_aliquot = 0x80000
reference_tracking_enable = 0x0
reference_history = 0x3
spa_max_replication_override = 0x3
spa_mode_global = 0x3
zfs_flags = 0xfffffdde
zfs_txg_timeout = 0x5
zfs_vdev_cache_max = 0x4000
zfs_vdev_cache_size = 0x0
zfs_vdev_cache_bshift = 0x10
vdev_mirror_shift = 0x15
zfs_scrub_limit = 0xa
zfs_no_scrub_io = 0x0
zfs_no_scrub_prefetch = 0x0
zfs_vdev_aggregation_limit = 0x20000
fzap_default_block_shift = 0xe
zfs_immediate_write_sz = 0x8000
zfs_read_chunk_size = 0x100000
zfs_nocacheflush = 0x0
zil_replay_disable = 0x0
metaslab_gang_bang = 0x1000001
metaslab_df_alloc_threshold = 0x20000
metaslab_df_free_pct = 0x4
zio_injection_enabled = 0x0
zvol_immediate_write_sz = 0x8000
loli@openindiana:~$ 
```

I have never used most of these tunables so i may have added something that 
should not be printed by `::zfs_params`: sorry about that.

Illumos issue: https://www.illumos.org/issues/9125
You can view, comment on, or merge this pull request online at:

  https://github.com/openzfs/openzfs/pull/554

-- Commit Summary --

  * 9125 mdb's ::zfs_params needs updating

-- File Changes --

    M usr/src/cmd/mdb/common/modules/zfs/zfs.c (208)

-- Patch Links --

https://github.com/openzfs/openzfs/pull/554.patch
https://github.com/openzfs/openzfs/pull/554.diff

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