From owner-freebsd-hackers@FreeBSD.ORG  Wed Mar  3 16:43:46 2010
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Date: Wed, 3 Mar 2010 17:43:11 +0100
From: Joerg Sonnenberger <joerg@britannica.bec.de>
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Subject: Re: GEOM_ULZMA
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On Wed, Mar 03, 2010 at 08:29:14AM -0800, Tim Kientzle wrote:
> Adrian Chadd wrote:
> >On 21 February 2010 02:20, Adrian Chadd <adrian@freebsd.org> wrote:
> >>Oh I know that! I'm just saying that I may try lzma'ing the kernel and
> >>rootfs's to see what kind of savings I get over gzip. :)
> >
> >The answer is "whoa". 24 megabyte compressed kernel + MDROOT drops to
> >6.5 megabytes with gzip -9 and a few bytes shy of 5 megabytes with a
> >default lzma compress.
> 
> Interesting question:  What is the impact on boot speed?
> It could be a lot faster to load 5MB from disk and
> decompress to a 24MB image than to wait for 24MB from
> disk.

I don't think it helps in terms of boot speed, at least as long as the
kernel image can be read without constant seeking.

Joerg