Just a status report on this, since 31% is such an outlandish claim...
I'm currently investigating why it is that my find atime command on my livecd typically shows about 20k/80k files accessed during a normal boot, versus 3k/80k on the f8 livecd. If anyone would like to venture speculation or facts as to which of those numbers is more realistic... Looking at the diffs, I know that 3k is missing some stuff, like, /etc/xdg/menus (the directory entry) not showing up, even though files under the directory show up. And I did extract the initramfs from the f8 livecd, change it's /etc/fstab, initramfs /init, and /sysroot/etc/fstab to all have atime,diratime instead of noatime and/or relatime. And I echod 0 to /proc/sys/fs/default_relatime as soon as proc was mounted.
( find / -xdev -atime -7 -exec ls -ld '{}' ';' > boot.afiles.list.txt )
Anyway, I still think I can get significant improvement, but there are a
lot of experiments and trials to run.
In general, I'm also going to try ordering the filesystem with all directory entries together, and symlinks together, to see how that helps compression. Likewise all text files, and all these things alpha and size sorted. I'm particularly interested if anyone has speculation as to why clustering the directory entries and symlinks might be some bad cornercase for ext3 filesystem performance.
And unfortunately I can't get the dm-reverse kernel module to compile easily (don't think anyone's actually used it in years). But I may go back to my own kludge, somewhat similar to the perl extent reversing example in the dm docs.
I'll let you all know how it goes... Maybe nowhere, maybe it'll speed up boot 50% and make space for another 10MB of compressed stuff...
-dmc Douglas McClendon wrote:
Douglas McClendon wrote: ...Thus, what I tenatively see, beyond the 4.5M of free space, is a 31% speedup (203s/154s)So, going forward, I plan to[1]A) do some sick stuff to get those early files on the outter rim of the cdrom, which I think may get further significant gains by itself, and perhaps even push my SDMC method into the significantly profitable area (though I don't much care at this point).And here I was thinking of doing my own kludge, but yet AGAIN, Device Mapper Is Just So Cool - (dm-reverse)http://sources.redhat.com/cgi-bin/cvsweb.cgi/device-mapper/contrib/?cvsroot=dm-dmc -- Fedora-livecd-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/fedora-livecd-list
-- Fedora-livecd-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/fedora-livecd-list
