diff --git a/roles/core/sysctl/files/sysctl.conf b/roles/core/sysctl/files/sysctl.conf
index 1f2a285..86819ff 100644
--- a/roles/core/sysctl/files/sysctl.conf
+++ b/roles/core/sysctl/files/sysctl.conf
@@ -1,22 +1,35 @@
 #   -------------------------------------------------------------
 #   Kernel state configuration
 #   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 #   Project:        Nasqueron
 #   Created:        2017-11-06
 #   License:        Trivial work, not eligible to copyright
 #   Source file:    roles/core/sysctl/files/sysctl.conf
 #   -------------------------------------------------------------
 #
 #   <auto-generated>
 #       This file is managed by our rOPS SaltStack repository.
 #
 #       Changes to this file may cause incorrect behavior
 #       and will be lost if the state is redeployed.
 #   </auto-generated>
 
 #   -------------------------------------------------------------
 #   VFS — kernel interface to file systems
 #   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 # Allow user to mount disks (required by FUSE or PEFS)
 vfs.usermount=1
+
+{% if use_zfs %}
+
+{% if mem < 4096 %}
+# Maximum size of the Adaptive Replacement Cache (ARC).
+vfs.zfs.arc_max = 2147483648
+{% endif %}
+
+# Keep prefetch: this works by reading larger blocks than were requested
+# into the ARC in hopes that the data will be needed soon.
+vfs.zfs.prefetch_disable=0
+
+{% endif %}
diff --git a/roles/core/sysctl/init.sls b/roles/core/sysctl/init.sls
index 2802124..9410121 100644
--- a/roles/core/sysctl/init.sls
+++ b/roles/core/sysctl/init.sls
@@ -1,16 +1,22 @@
 #   -------------------------------------------------------------
 #   Salt — Kernel state
 #   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 #   Project:        Nasqueron
 #   Created:        2017-11-06
 #   License:        Trivial work, not eligible to copyright
 #
 #   -------------------------------------------------------------
 
 {% if grains['os'] == 'FreeBSD' %}
 
+{% set use_zfs = salt['node.has']('zfs:pool') %}
+
 /etc/sysctl.conf:
   file.managed:
     - source: salt://roles/core/sysctl/files/sysctl.conf
+    - template: jinja
+    - context:
+        use_zfs: {{ use_zfs }}
+        mem: {{ grains['mem_total'] }}
 
 {% endif %}