I thought bootup was mostly I/O limited on most systems, unless the
readahead really gets almost everything into the cache.  disk seeks are
slow, and there are a _lot_ of small config files to read.  And then
there's sleeps while modules detect hardware after they load, and
network (dhcp) delays.

 Won't a reasonable governor bump up the cpu speed when needed?  It
seems like a real waste to have the cpu at full speed while waiting for
DHCP.

 Of course, I can't argue with real data.  What CPU, RAM, and disk do
you have?  and how fast is your disk: RPM is a pretty good measure of
seek time, and hdparm -t /dev/hda is a useful sequential read test.

-- 
Use performance governor during boot
https://launchpad.net/bugs/9805

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