View source for Swapfile

= Raspberry Pi =
== Remove Swapfile ==
<pre>
dphys-swapfile swapoff
dphys-swapfile uninstall
</pre>

Remove dphys-swapfile application and dependency
<pre>
apt-get purge -y dphys-swapfile dc
</pre>

= Banana Pi = 

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

== Deleting Swap File ==
<pre>
swapoff /swapfile1
</pre>

<pre>
rm -f /swapfile1
</pre>


== Creating Swap File ==

=== Hard Disk Partition ===
The parition needs to be created as a swapfile and not ext3, ext4 or something else.
<pre>
mktemp /dev/sda1
</pre>

=== File ===
Create a file of 1GB
<pre>
dd if=/dev/zero of=/swapfile1 bs=512 count=2048
chmod 600 /swapfile1
mkswap /swapfile1
swapon /swapfile1
</pre>

== fstabs ==
<pre>
vi /etc/fstab
</pre>

Add an entry or change the existing one
<pre>
/dev/sda1 swap swap defaults 0 0
</pre>

or 
<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 : Raspbian]] [[Category : Banana Pi]]  [[Category : Linux]]