Date: Fri, 23 Sep 2005 14:59:17 +0100 From: Brian Candler <B.Candler@pobox.com> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: current@freebsd.org Subject: Re: using bzip2 to compress man-pages Message-ID: <20050923135917.GA97140@uk.tiscali.com> In-Reply-To: <200509221652.54123.mi%2Bmx@aldan.algebra.com> References: <200509220446.j8M4kBPA019823@blue.virtual-estates.net> <20050922182104.GC990@galgenberg.net> <CF4FBAB7-791D-41E0-B59B-9D78C6E4381F@mac.com> <200509221652.54123.mi%2Bmx@aldan.algebra.com>
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On Thu, Sep 22, 2005 at 04:52:53PM -0400, Mikhail Teterin wrote: > The space-saving potential can substantial, however -- see below. Being able > to stick us useful root filesystem (with /usr) onto a USB key can be useful > for some applications. Of course, if space is that critical you don't need to install the 'manpages' distribution set in the first place. However I have another suggestion. For USB pen drives, if you don't mind your /usr filesystem being read-only then you can get a big benefit from using geom_uzip. I've just tried it on the manpages: # du -sk /usr/share/man 17978 /usr/share/man # dd if=/dev/zero of=test.ufs bs=1k count=50k # mdconfig -a -t vnode -f test.ufs -u 0 # bsdlabel -w md0 auto # newfs -m 0 -i 1024 md0c # mount /dev/md0c /mnt # tar -C /usr/share/man -cf - . | tar -C /mnt -xf - # note, lots of hard links # df -k Filesystem 1K-blocks Used Avail Capacity Mounted on ... /dev/md0c 44526 17980 26546 40% /mnt # umount /mnt # mdconfig -d -u 0 # mkuzip test.ufs # ls -l test.ufs.uzip -rw-r--r-- 1 root brian 12966912 Sep 23 14:42 test.ufs.uzip # mdconfig -a -t vnode -f test.ufs.uzip -u 0 # mount -r /dev/md0.uzip /mnt # df -k ... /dev/md0.uzip 44526 17980 26546 40% /mnt That's a reduction from 17978K to 12663K, or 30%, even though all these files are already compressed (apart from /usr/share/man/whatis, which is only 210K). I expect that's due to the partial sectors at the end of all these small files. I've never tried booting from a geom_uzip filesystem, but I don't see why it shouldn't work :-) Regards, Brian.
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