does zram in fedora need any configuration

[Reindl Harald]

Hi

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the article below maybe outdated, on a rawhide-VM exists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

[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@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 the article below maybe outdated, on a rawhide-VM exists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

[Reindl Harald]

mailing-list stripped the 3.9 KB src.rpm :-(
http://access.thelounge.net/harry/zram-1.0.0-1.fc20.20140327.rh.src.rpm

Am 27.03.2014 18:01, schrieb 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@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