Hi utu,
finally I find the way...

Code:
modprobe zram   #I do not think is necessary if your system has / dev/zram0
echo $((100*1024*1204)) > /sys/block/zram0/disksize   #Allocate 100MB to zram. (Check if the file disksize is present in CD version)
mkswap /dev/zram0   #create swap in Ram
swapon -p 100 /dev/zram0   #activate swap. You can specify the priority of the swap device
Code:
root@Black:~# free
             total       used       free     shared    buffers     cached
Mem:       1018724     943440      75284          0      58860     599440
-/+ buffers/cache:     285140     733584
Swap:       102396          0     102396
Now it's time to test performance...

Best Regards