diff --git a/gui/services/migrations/0026_delete_vm_kmem_size_tunable.py b/gui/services/migrations/0026_delete_vm_kmem_size_tunable.py
new file mode 100644
index 000000000000..9b537cbf25de
--- /dev/null
+++ b/gui/services/migrations/0026_delete_vm_kmem_size_tunable.py
@@ -0,0 +1,22 @@
+from django.db import migrations
+
+
+def delete_vm_kmem_size(apps, schemaeditor):
+    tunables = apps.get_model('system', 'tunable')
+    kmem_size_tunable = tunables.objects.filter(tun_var='vm.kmem_size',
+                                                tun_comment='Generated by autotune')
+    kmem_size_tunable.delete()
+
+
+class Migration(migration.Migration):
+
+    dependencies = [
+        ('services', '0026_s3_fields'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            delete_vm_kmem_size
+        ),
+    ]
+
diff --git a/src/autotune/files/autotune.py b/src/autotune/files/autotune.py
index 3449cf5e3861..f91f047fdc6b 100755
--- a/src/autotune/files/autotune.py
+++ b/src/autotune/files/autotune.py
@@ -97,25 +97,6 @@ def popen(cmd):
     return p.communicate()[0]
 
 
-def get_interfaces(include_fake=False):
-
-    interfaces = popen('ifconfig -l')
-
-    fake_interfaces = (
-                       'ipfw',
-                       'lo',
-                       'pflog',
-                       'pfsync',
-                      )
-
-    interfaces = interfaces.split()
-
-    if include_fake:
-        return interfaces
-    return filter(lambda i: not re.match('^(%s)\d+$'
-                  % ('|'.join(fake_interfaces), ), i), interfaces)
-
-
 def sysctl(oid):
     """Quick and dirty means of doing sysctl -n"""
     return popen('sysctl -n %s' % (oid, ))
@@ -134,7 +115,6 @@ def sysctl_int(oid):
 # as a valid choice to the -c option.
 DEF_KNOBS = {
     'loader': {
-        'vm.kmem_size',
         'vfs.zfs.dirty_data_max_max',
     },
     'sysctl': {
@@ -167,10 +147,6 @@ def sysctl_int(oid):
 }
 
 
-def guess_vm_kmem_size():
-    return int(1.25 * HW_PHYSMEM)
-
-
 def guess_vfs_zfs_dirty_data_max_max():
     if TRUENAS and hardware[0].startswith("M"):
         return 12 * GB
@@ -352,7 +328,7 @@ def guess_vfs_zfs_metaslab_lba_weighting_enabled():
 
 
 def guess_vfs_zfs_zfetch_max_distance():
-    return 33554432
+    return 32 * MB
 
 
 def main(argv):