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Changing swappiness in sysctl.conf doesn't work for me

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http://askubuntu.com – I'm using 12.04 LTS and can sudo sysctl to set swappiness to 10, but adding vm.swappiness=10 to sysctl.conf doesn't work for me - after I reboot, swappiness still reports 60 (default) I'd like to be able to reduce swaps to my SSD, but can't find a way to do so except manually per session. Modifying sysctl.conf seems to work for most - can anyone advise what I need to check / change to make it work for me too, please? (HowTos)

Danial's picture
Submitted by Danial on 09/23/2012

Stories similar to Changing swappiness in sysctl.conf doesn't work for me

My Ubuntu 12.04 x64 on Dell XPS 15 with 8GB of RAM has been really sluggish.

After some searching I came across post about swappiness.

Swappiness parameter 2 years 22 weeks ago

Hi all! "swappiness" in /etc/sysctl.conf - is it only for kernel or for the whole system to go to swap-file/partition?

^ That's the traditional way of disabling IPv6 system-wide, opposed to browser-specific solutions (e.g. about:config -> filter for ipv6 -> disable it there)  The folder /etc/sysctl.conf.d/ or the file /etc/sysctl.conf is quite interesting if you want to play around with the internals; this file is infamous for setting the swappiness.

I have set swappiness to 0: # sysctl vm.swappiness vm.swappiness = 0

According to various sources, this should mean that applications have priority over file chaches, and swap should only be used when the applications themselves need more memory than is physically available.

INIT: Entering runlevel: 5error: Unknown parameter "-p/etc/sysctl.conf"usage:  sysctl [-n] [-e] variable ... sysctl [-n] [-e] [-q] -w variable=value ...

Hi,

usually you enable things like IP forwarding in /etc/sysctl.conf. Now I read through the UFW firewall documentation, and regarding to that, it has it's own sysctl.conf file in /etc/ufw.

Why is that? What happens if I enable UFW and have things configured in /etc/sysctl.conf? Will UFW overrule these settings with whatever is in /etc/ufw/sysctl.conf?

I'm trying to make some changes to sysctl on an Android phone (LG Thrill). I've rooted the phone and am using the stock ROM (and would prefer to stick with the stock ROM if possible). Unfortunately, there is no sysctl.conf file for me to work with present on the phone. Sysctl itself is present though and I can make changes via terminal, though those changes are not persistent across reboots.

/etc/sysctl.conf file 34 weeks 6 days ago

Just to let everyone know...

There is no longer a /etc/sysctl.conf file in Fedora 18.

The defaults that were in the /etc/sysctl.conf file are now set in the /usr/lib/sysctl.d/00-system.conf file.

If you need to change the defaults that you used to add to the /etc/sysctl.conf file, you now need to create a file in /etc/sysctl.d/ and set it that way.

What's the location of the sysctl.conf file on lion? In Snow Leopard it was in /etc/sysctl.conf but now that folder doesn't contain it anymore. Searching for the file in spotlight yields no results.

Have the shared memory settings been moved to a different conf file? What is it's name?

EDIT

I am trying to modify the kernel shared memory settings of the machine.