readahead slows down boot
Alexander Heinlein
alexander.heinlein at web.de
Sat Mar 29 19:42:38 UTC 2008
Hi.
I tried to improve my boot time by using readahead. After booting with
"profile" readahead generated /etc/readahead/boot. But now my boot time
increased from 30s to 41s. readahead takes really long during "Reading files
needed to boot...".
bootchart output:
- without readahead:
http://choerbaert.org/scy/pics/bootchart/2.6.24.4_normal.png
- with readahead:
http://choerbaert.org/scy/pics/bootchart/2.6.24.4_readahead.png
Hardware:
1.86GHz CPU, 1024MB RAM, harddisk reaches about 42 MB/sec
What's the reason for this strange result?
Regards,
Alex
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