Comment 4 for bug 737148

There's no single thing that stands out to me in the plumbing layer; everything just generally seems to be taking that little bit longer. I suspect that differences in individual small processes like sh and sysctl that show up in the bootchart is that they just happen to be over bootchart's threshold for paying attention.

One thing I do notice is that I/O is much spikier during ureadahead. Is the ureadahead profile up to date? You can force this by running:

  rm -f /var/lib/ureadahead/pack /var/lib/ureadahead/*.pack

(*.pack may not exist - don't worry about that) then reboot, leave it up for a minute or so after boot to give it time to prepare the profile, and then run bootchart on the following run.