svn commit: r264027 - in head: release share/man/man7

[Glen Barber]

On Wed, Apr 02, 2014 at 10:40:22AM -0500, Brooks Davis wrote:
> On Tue, Apr 01, 2014 at 10:41:27PM +0000, Glen Barber wrote:
> > Author: gjb
> > Date: Tue Apr  1 22:41:26 2014
> > New Revision: 264027
> > URL: http://svnweb.freebsd.org/changeset/base/264027
> > 
> > Log:
> >   Add a new release build variable, WITH_COMPRESSED_IMAGES.
> >   
> >   When set to a non-empty value, the installation medium is
> >   compressed with gzip(1) as part of the 'install' target in
> >   the release/ directory.
> >   
> >   With gzip(1) compression, downloadable image are reduced in
> >   size quite significantly.  Build test against head at 263927
> >   shows the following:
> >   
> >    bootonly.iso:		64% smaller
> >    disc1.iso:		44% smaller
> >    memstick.img:		47% smaller
> >    mini-memstick.img:	65% smaller
> >    dvd1.iso:		untested
> >   
> >   This option is off by default, I would eventually like to
> >   turn it on by default, and remove the '-k' flag to gzip(1)
> >   so only compressed images are published on FTP.
> 
> I'd recommend testing xz compression as well.  With UFS images of a full
> world the savings vs gzip are significant (more than 30% IIRC, but it's
> need more than a year since I checked so I'm a bit unsure of the exact
> numbers).
> 

delphij also brought this up.

I have concerns with xz(1), since there was mention in IRC that Windows
users may have problems decompressing xz-compressed images.  So, gzip(1)
is used because it seems to be the more commonly-supported archive
mechanisms.

The benefit of xz(1) over gzip(1) was only 50M-ish.

  -rw-r--r--  1 root  wheel   601M Mar 28 20:18 disc1.iso
  -rw-r--r--  1 root  wheel   381M Mar 28 20:18 disc1.iso.bz2
  -rw-r--r--  1 root  wheel   392M Mar 28 20:18 disc1.iso.gz
  -rw-r--r--  1 root  wheel   348M Mar 28 20:18 disc1.iso.xz

Glen

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