Revision as of 03:08, 22 June 2016

I've written this based on my experience of Bananian which is Debian based.

Deleting Swap File

swapoff /swapfile1

rm -f /swapfile1

The parition needs to be created as a swapfile and not ext3, ext4 or something else.

mktemp /dev/sda1

Create a file of 1GB

dd if=/dev/zero of=/swapfile1 bs=512 count=2048
chmod 600 /swapfile1
mkswap /swapfile1
swapon /swapfile1

vi /etc/fstab

Add an entry or change the existing one

/dev/sda1 swap swap defaults 0 0

or

/swapfile1 swap swap defaults 0 0

vi /etc/sysctl.conf

vm.swappiness Values

Value	Strategy
0	The kernel will swap only to avoid an out of memory condition, when free memory will be below vm.min_free_kbytes limit. See the "VM Sysctl documentation".
1	Kernel version 3.5 and over, as well as Red Hat kernel version 2.6.32-303 and over: Minimum amount of swapping without disabling it entirely.
10	This value is sometimes recommended to improve performance when sufficient memory exists in a system.
60	The default value.
100	The kernel will swap aggressively.

After reboot check current value

cat /proc/sys/vm/swappiness

@@ Line 41: / Line 41: @@
 <pre>
 /swapfile1 swap swap defaults 0 0
+</pre>
+= swapiness =
+<pre>
+vi /etc/sysctl.conf
+</pre>
+vm.swappiness Values
+{|
+|Value
+|Strategy
+|-
+|0
+|The kernel will swap only to avoid an out of memory condition, when free memory will be below vm.min_free_kbytes limit. See the "VM Sysctl documentation".
+|-
+|1
+|Kernel version 3.5 and over, as well as Red Hat kernel version 2.6.32-303 and over: Minimum amount of swapping without disabling it entirely.
+|-
+|10
+|This value is sometimes recommended to improve performance when sufficient memory exists in a system.
+|-
+|60
+|The default value.
+|-
+|100
+|The kernel will swap aggressively.
+|}
+After reboot check current value
+<pre>
+cat /proc/sys/vm/swappiness
 </pre>
 [[Category : Banana Pi]]  [[Category : Linux]]