does zram in fedora need any configuration

[Reindl Harald]

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 at rawhide ~]# free
             total       used       free     shared    buffers     cached
Mem:           742        136        606          4          7         69
-/+ buffers/cache:         59        683
Swap:          148          0        148


[root at rawhide ~]# systemctl start zram.service
[root at 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 at rawhide ~]# htop
[root at 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 at 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 the article below maybe outdated, on a rawhide-VM exists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 at 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