02.02.2014 17:23, Pacho Ramos wrote:
Hello
After reading:
http://www.chromestory.com/2013/03/google-enabling-zram-for-chrome-os-by-default/
http://lwn.net/Articles/545244/
I was wondering what would be the best way to use zram on a setup
running systemd. This is because I have found a lot of scripts, unit
files... but I don't know what is the best approach (at least from an
"upstream point of view"):
http://mystilleef.blogspot.com.es/2011/10/enable-zram-in-fedora.html
http://software.opensuse.org/package/systemd-zram-service
https://aur.archlinux.org/packages/zramswap/
I found this thread:
http://lists.freedesktop.org/archives/systemd-devel/2012-November/007444.html
In that one Lennart suggest that maybe some action from util-linux
maintainers could help but, after that message, I don't see anything
newer (maybe we could report that suggestion to util-linux maintainers
to other place... or maybe a better solution was found later :/)
Thanks a lot for your help and suggestions
Here is what I use. I don't claim this to be the best or even
officially-approved solution. But this is based on the existing Gentoo
documentation, found at
http://wiki.gentoo.org/wiki/Zram#Using_existing_tools :)
$ cat /etc/udev/rules.d/10-zram.rules
KERNEL=="zram[0-9]", SUBSYSTEM=="block", DRIVER=="", ACTION=="add",
ATTR{disksize}=="0", ATTR{disksize}="1536M", RUN+="/sbin/mkswap
$env{DEVNAME}"
$ cat /etc/fstab
# /etc/fstab: static file system information.
<snip irrelenavt lines>
/dev/zram0 none swap pri=10,discard 0 0
/dev/zram1 none swap pri=10,discard 0 0
/dev/zram2 none swap pri=10,discard 0 0
/dev/zram3 none swap pri=10,discard 0 0
Note that "discard" is essential here (and not mentioned in the Gentoo
wiki) so that zram returns once-used compressed swap to the system.
$ cat /etc/modprobe.d/zram.conf
options zram num_devices=4
$ cat /etc/modules-load.d/zram.conf
zram
--
Alexander E. Patrakov
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