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In recent distributions (kernel >=2.6.37) you have to load kernel module zram:
Controling zram depends on what distribution are you working on. For example, some tweaks for Debian:
http://forum.linuxvillage.org/index.php?topic=92.msg465#msg465
The most important thing is to control RAM dedicated to zram devices (/sys/block/zramX/disksize).
first you have to be sure that your kernel linux >2.6.37.1
than downlad and install the Zram package
