Speeding up live cd boot through optimizing file layout
krzysiek at lichota.net
Wed May 31 11:13:28 BST 2006
Krzysztof Lichota napisał(a):
> (Posted also to ubuntu-devel)
> I have taken a shot at optimizing boot speed of Kubuntu live CD by
> changing layout of files on CD (no changes to live CD contents).
> First results are promising. By using naive approach to sort files by
> first access during boot, I have shortened boot time by 15-20 seconds
> (from 1:53s to 1:33s on desktop machine, from 2:07s to 1:52s on laptop).
> This is time reported by bootchart, probably time until desktop appears
> is further shrunk.
> More details (including tools, bootcharts, sort file used for mksquashfs
> and ISO images) are on this page:
> I will try to squeeze more from this live CD, it seems there is room for
> further improvements.
> Verifications of results by some independent person would be welcome :)
I have timed boot manually until desktop appears. The results are really
Optimized CD boots 60 seconds faster in comparison to plain CD with
bootchart and about 35 seconds faster than original kubuntu RC1 live CD.
I haven't measured optimized CD without bootchart yet :)
Desktop - Athlon 1.2 Ghz, 256 MB RAM: Kubuntu with bootchart (3:44,
3:54), optimized CD with bootchart (2:47, 2:47), plain Kubuntu (3:22, 3:25)
I have updated my page
with latest results and added description how to produce trace (for
example for Ubuntu and Xubuntu).
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