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Re: Speedying up the boot for Fedora



Jean-Eric Cuendet wrote:

Hi,
To speed the boot of Fedora, the taken approach is to readahead the files needed by the daemons/tools run during boot. This approach works well but the actual approach is to pre-load some files from a static defined file. (This is accomplished by /etc/init.d/readahead which reads files from /etc/readahead.files)


There is IMHO at least 2 problems:
- When the boot process change, either by removing/adding services, the fiels that must be readahead change. But the readahead.files don't.
- The readahead process don't read the files in the best order to minimize the head movement on the hard disk
- The readahead process don't rearrange the files on disk so the readahead process can be quicker.


Why not implement a dynamic mechanism to know which files need to be read in readahead?
- End of kernel init
- Register a (KProbes or LSM?) hook that listen to which files are read
- Boot the system
- End of system boot, read the files that were read during boot itself.
- Update the readahead.files file so the readahead could be quicker.


A second step could be to rearrange the files so the readahead could read them without too much head movemement on the HD. Perhaps with help of e2fsdefrag?

Do you have any comment?
-jec

This sort of discussion would probably be more relevant in the Fedora-devel list. Please read the Fedora-devel list archives first. Kindly move the discussion there if you wish to continue

regards
Rahul


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