Using zram (was compcache)

I've tried compcache but dont get good result:
http://superbiji.blogspot.com/2010/12/enable-compcache-in-ubuntu.html

But zram seem working fine. Compcache will be included in 2.6.37 kernel, named: zram. But if you want to try it follow this step:

Download and install 2.6.36 kernel from here:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.36.2-natty/

Get compcache source (not tar.gz), if you get compile error see reference below:

hg clone https://compcache.googlecode.com/hg/ compcache

make

cp zram.ko /lib/modules/2.6.36-02063602-generic/updates/

depmod -a

Add this to /etc/rc.local:

# if you have 2 core

modprobe zram num_devices=2

# 500mb each, usually compressed to 80%

echo 524288000 > /sys/block/zram0/disksize

echo 524288000 > /sys/block/zram1/disksize

mkswap /dev/zram0

mkswap /dev/zram1

swapon /dev/zram0 -p 100

swapon /dev/zram1 -p 100

Next, reboot and run big apps like eclipse, 3 virtual machines

Reference:

• http://www.vflare.org/2010/05/compressed-ram-disk-for-windows-virtual.html
• http://code.google.com/p/compcache/issues/detail?id=77