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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 %}

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