On Thu, Apr 21, 2005 at 03:20:53PM +0200, Arjan van de Ven wrote: > On Thu, 2005-04-21 at 15:01 +0200, 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 > > this one is easy to fix btw; I wrote a small tool a while ago (and > posted to the list) to sort the file in disk order Something I noticed a few days ago was that running filefrag on a freshly installed system shows a lot of files using multiple extents (sometimes dozens), rather than a single extent. I've no idea how much difference this would make in the real-world, (maybe none due to the drive internal read-ahead) but it was surprising to see bits of openoffice using up 80-90 extents for eg. Dave
