Best way to use zram in Fedora 21?

[Dan Horák]

On Mon, 8 Dec 2014 11:36:47 +0100
Karel Zak <kzak at redhat.com> wrote:

> On Tue, Nov 25, 2014 at 09:03:20PM +0100, Juan Orti wrote:
> > Hi, I know how to manually configure the zram, but what's the best
> > way to do it?
> > 
> > I've seen the unit zram.service of anaconda-core, and it gets
> > activated when booting with inst.zram=on, but it looks like very
> > anaconda-centric.
> > 
> > Should something like [1] be packaged and included in the distro? or
> > maybe we should spin off the anaconda zram.service and do it more
> > generic.
> > 
> > I think this is a very interesting feature for memory constrained
> > VMs and other devices.
> > 
> > [1] https://github.com/mystilleef/FedoraZram
> 
> 
> BTW, util-linux v2.26 (f22) is going to contain new command zramctl(8)
> 
>     Karel
> 
> 
> $ zramctl --help
> 
> Usage:
>  lt-zramctl [options] <device>
>  lt-zramctl -r <device> [...]
>  lt-zramctl [options] -f | <device> -s <size>
> 
> Options:
>  -a, --algorithm lzo|lz4   compression algorithm to use

can this work with HW accelerated compressors like the one in IBM Power
CPUs? See eg.
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/W51a7ffcf4dfd_4b40_9d82_446ebc23c550/page/Build%20F17%20with%20Memory%20Compression


		Dan

>  -b, --bytes               print sizes in bytes rather than in human
> readable format -f, --find                find a free device
>  -n, --noheadings          don't print headings
>  -o, --output <list>       columns to use for status output
>      --raw                 use raw status output format
>  -r, --reset               reset all specified devices
>  -s, --size <size>         device size
>  -t, --streams <number>    number of compression streams
> 
>  -h, --help     display this help and exit
>  -V, --version  output version information and exit
> 
> Available columns (for --output):
>         NAME  zram device name
>     DISKSIZE  limit on the uncompressed amount of data
>         DATA  uncompressed size of stored data
>        COMPR  compressed size of stored data
>    ALGORITHM  the selected compression algorithm
>      STREAMS  number of concurrent compress operations
>   ZERO-PAGES  empty pages with no allocated memory
>        TOTAL  all memory including allocator fragmentation and
> metadata overhead MOUNTPOINT  where the device is mounted
> 
> For more details see zramctl(8).
> 
> 
> 
> -- 
>  Karel Zak  <kzak at redhat.com>
>  http://karelzak.blogspot.com
> -- 
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