On Sat, Jun 30, 2012 at 11:01:47PM -0400, Milan Kupcevic wrote:
> The attached patch brings vmlinuz from about 13MB to about 9.5MB, which
> is well under the 12MB limit. Downside is that xz compressing is
> noticeably slower than currently used gzip, but decompressing speed
> difference is not noticeable.
>
> I've tested it on Pegasos II machine, it boots really fast. Updated
> mkvmlinuz package is waiting on mentors.debian.net for a willing sponsor
> for upload.
> ...
> +if test "$post_2_6_38"; then
> + XZ="xz --check=crc32 -8"
> +else
> + XZ=false
> +fi
>From xz(1) manual page (you can ignore DecMem):
Preset DictSize CompCPU CompMem DecMem
-0 256 KiB 0 3 MiB 1 MiB
-1 1 MiB 1 9 MiB 2 MiB
-2 2 MiB 2 17 MiB 3 MiB
-3 4 MiB 3 32 MiB 5 MiB
-4 4 MiB 4 48 MiB 5 MiB
-5 8 MiB 5 94 MiB 9 MiB
-6 8 MiB 6 94 MiB 9 MiB
-7 16 MiB 6 186 MiB 17 MiB
-8 32 MiB 6 370 MiB 33 MiB
-9 64 MiB 6 674 MiB 65 MiB
Better to use default setting "-6" that has lower memory requirement.
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