Hi Utu,
yes in knoppix 6.7.1 /dev/zram0 is defined but not inizialized, i think.
take a look at the value = 0 in file called disksize in /sys/devices/virtual/block/zram0
and then at the file Kconfig in /usr/src/linux-headers-3.0.4/drivers/staging/zram
and even at Kconfig in /usr/src/linux-headers-3.0.4/drivers/staging

i read again the user's comment in http://www.webupd8.org/2011/10/incre...inux-with.html
I tried in terminal:
Code:
root@Black:~# modprobe zram disksize=524288   #probably do not need ad i've to modify directly file called disksize 
root@Black:~# mkswap /dev/zram0
mkswap: error: swap area needs to be at least 40 KiB
Usage: mkswap [-c] [-pPAGESZ] [-L label] [-U UUID] /dev/name [blocks]
root@Black:~# swapon -p 100 /dev/zram0
swapon: /dev/zram0: read swap header failed: Argomento non valido
root@Black:~#
but nothing. Sure i'm wrong

and like you say it might be a nice feature for net-book with only 1GB Ram and low power CPU
for now I optimize knoppix moving the browser cache, log, tmp and spool in tmpfs
http://www.fewt.com/2010/07/move-you...es-to-ram.html

bye