Significant performance problem with modprobe

Lauri Kasanen curaga at operamail.com
Tue Jun 14 14:06:47 UTC 2011


Hi

I replaced bb modprobe with the latest module-init-tools one (3.16) and
ran the mod-init-tools depmod (to generate the .bin files).
Rather curiously, doing that dropped 28% off the boot time ;) Consider
this issue confirmed.

I then removed the .bin files, to test the full modprobe with the same
alias files as bb. The boot was still 23% faster than with bb modprobe.

Bootchart 1, module-init-tools + bin:
http://www.shareapic.net/Zoom-25083078-TC.html
Bootchart 2, module-init-tools:
http://www.shareapic.net/Zoom-25083079-TC.html

So there's obviously something else besides the bin files going on. I
guess I'll record all the calls to modprobe, to get a test set.

- Lauri

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