On Fri, 2007-07-06 at 18:17 -0400, Alan Cox wrote: > On Fri, Jul 06, 2007 at 05:56:35PM -0400, Colin Walters wrote: > > Ok, I just googled and found a really good thread: > > http://kerneltrap.org/node/2157 > > > > It's unclear to me though how much of this is actually running now. > > Quite a bit in terms of the disk layer. We readahead and writebehind, As I understand the readahead, it is simply requesting further blocks inside a single file before the read() requests come in for them. The Hot File Clustering system on that page actually moves the files into a special area of the disk and and ensures they're contiguous (thus avoiding seeks, which plain readahead doesn't really solve). Both OS X and Windows include systems which watch the startup and continually optimize. Looking at Fedora, we have the "readahead" package, but as far as I can tell it's static in the sense that we ship some definitions with the package; it's never rerun. Has anyone run a current version of http://bootchart.org/ on Fedora? -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
