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Date:      Sun, 13 Oct 2002 16:50:43 -0700
From:      Terry Lambert <tlambert2@mindspring.com>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Giorgos Keramidas <keramida@ceid.upatras.gr>, current@FreeBSD.ORG
Subject:   Re: HEADS UP: Old port recompiles needed (Re: Unknown symbol "__sF")
Message-ID:  <3DAA06D3.CF5BBDA6@mindspring.com>
References:  <20021013194319.7A31D2A88D@canning.wemm.org> <3DA9D95D.C1319A72@mindspring.com> <20021013205915.GK10829@hades.hell.gr> <3DA9EA62.D337E8A0@mindspring.com> <200210132203.g9DM3NGc057218@apollo.backplane.com>

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Matthew Dillon wrote:
> :% ls -l
> :248643584 Sep 17 00:03 5.0-CURRENT-20020917-JPSNAP.iso
> :212988130 Oct 13 10:39 5.0-CURRENT-20020917-JPSNAP.iso.gz
> :
> :Compression gets rid of about 36MB.
> :
> :That's 3.4 hours saved on a 28.8K modem download time, overall...
> :a 14% reduction in size.
> 
>     Well, ok, but on a percentage basis you don't get much out of it.
>     If someone is downloading via a modem they're probably doing it
>     overnight anyway.

And that's OK, because we all live in countries that don't charge
time or message units for phone calls, right?  8-) 8-).


>     bzip2 does even worse then gz in this instance, so no magic
>     there either.

Bzip sucks.  It was invented to get out from under a patent that is
now expired.

>     -rw-r--r--  1 dillon  wheel  179985801 Oct 13 15:00 bzip2.bz2       (bzip2 -9)
>     -rw-r--r--  1 dillon  wheel  178963831 Oct 13 14:56 gzip9.gz        (gzip -9)
>     -rw-r--r--  1 dillon  wheel  187006976 Jun  8 00:04 miniinst-RC4-8Jun2002.iso

The gzip number I gave was for the default (-6), not -9.  The -9 only
dropped 600K more out; every little bit helps, though.  I gave the
default number to make it repeatable, and to give a valid baseline
vs. all the compressed data, which was uncompressible because it was
otself "-6".

A lot of things in the less minimal distributions are more compressible.

The ISO for the "live FS image" is *immensely* compressible.

-- Terry

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