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

[Glen Barber]

On Wed, Apr 02, 2014 at 11:55:33AM -0400, Nikolai Lifanov wrote:
> On 04/02/14 11:51, Glen Barber wrote:
> > 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
> > 
> 
> How about 7zip (Windows program, not file format)? What would a Windows
> user use that can decompress gzip and not xz? It was a problem around
> ~2007, but xz support is no longer rare or exotic.
> 

I don't know, to be honest.  I have no Windows machines to test, so
I can only go by what I am told.

Glen

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