answered that myself
* it needs configuration
* src.rpm built on F20 and tested on Rawhide attached
* that below is a VM with 2 virtual CPU cores
* configuration is 20% of RAM and one zram-device per core
[root@rawhide ~]# free
total used free shared buffers cached
Mem: 742 136 606 4 7 69
-/+ buffers/cache: 59 683
Swap: 148 0 148
[root@rawhide ~]# systemctl start zram.service
[root@rawhide ~]# dmesg
[ 290.085329] zram: Created 2 device(s) ...
[ 290.092406] Adding 76004k swap on /dev/zram0. Priority:100 extents:1 across:76004k SSFS
[ 290.096359] Adding 76004k swap on /dev/zram1. Priority:100 extents:1 across:76004k SSFS
[root@rawhide ~]# htop
[root@rawhide ~]# systemctl list-units | grep zram
sys-devices-virtual-block-zram0.device loaded active
plugged /sys/devices/virtual/block/zram0
sys-devices-virtual-block-zram1.device loaded active
plugged /sys/devices/virtual/block/zram1
zram.service loaded active
exited Enable compressed swap in memory using zram
dev-zram0.swap loaded active
active /dev/zram0
dev-zram1.swap loaded active
active /dev/zram1
[root@rawhide ~]#
Am 27.03.2014 17:18, schrieb Reindl Harald:
> since 3.14 is not that far away zram becomes interesting
>
> the article below maybe outdated, on a rawhide-VM exists
> /dev/zram0 as well as a implicit systemd-unit, well
> does that mean it is automagically configured and if
> that is the case does systemd < 212 that also or is
> there handwork needed for the time F19/F20 get rebased
> to kernel 3.14?
>
> [root@rawhide ~]# systemctl list-units | grep zram
> sys-devices-virtual-block-zram0.device loaded active plugged /sys/devices/virtual/block/zram0
>
> http://mystilleef.blogspot.co.at/2011/10/enable-zram-in-fedora.html
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