zram for Fedora
zram compresses swap partitions into RAM for performance.
You need Linux kernel version 220.127.116.11 or better to use zram. For Fedora 16 you can just install kmod-staging from rpmfusion to get the module:
sudo yum install kmod-staging
First you have to setup your rpm build environment. For details see How to create an RPM package - Preparing your system.
# Short version of the howto sudo yum install @development-tools fedora-packager rpmdev-setuptree # the real thing(tm) make rpm sudo rpm -Uhv ~/rpmbuild/RPMS/noarch/zram-*.noarch.rpm
There are 4 files you need to enable zram for Fedora. They are:
All these files can be found in the project directory.
Place "zramstart", zramstat and "zramstop" in the following directory.
Place "zram.service" in the following directory.
Place "zram" in the following directory.
As root, run the following command to enable zram for Fedora.
sudo systemctl enable zram.service sudo systemctl start zram.service
Run the following command to make sure the service started properly.
sudo systemctl status zram.service
The output should look like this:
zram.service - Enable compressed swap in memory using zram Loaded: loaded (/lib/systemd/system/zram.service; enabled) Active: active (exited) since Sun, 02 Oct 2011 22:46:31 -0400; 44min ago Process: 942 ExecStart=/usr/sbin/zramstart (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/zram.service
To see how well your compressed swap performs run
zramstat # no sudo needed
The output looks like this:
/dev/zram0: 362.18% (180998144 -> 49973309) /dev/zram1: 356.50% (180924416 -> 50749160)
This means 180,998,144 bytes got compressed to 49,973,309 bytes. The "swapped" memory is 362.18% of the RAM used. That's it!
The zramstart and zramstop scripts were written by Sergey Davidoff of Elementary OS. The zramstat script and RPM packaging bits by Doncho N. Gunchev.