How to permanently enable compressed ram swap? What version to use?
There's now a PPA that installs a proper Upstart script for enabling zram at boot-time. It chooses the correct size and number of compressed swap devices for your system.
https://launchpad.net/~shnatsel/+archive/zram
I was struggling with the same problem.
Today I found an excellent blog post about it. http://weirdfellow.wordpress.com/2011/05/04/compressed-ram-with-zram/
Although "sudo start zramswap" didn't work, when I restarted my PC it solved my problem perfectly.
Try it.