Harald Hoyer wrote: > http://www.harald-hoyer.de/personal/blog/fedora-10-boot-analysis > > A brief Fedora 10 boot analysis. > > Hardware: Asus EeePC 901 with a flash disk. > > Time taken from entering the encrypted root disk password until the password can > be entered (after pressing return in gdm). The 10 second wait in nash is ignored > here (which really annoys me and should be configurable in /etc/sysconfig/mkinitrd). > > Default Live CD Installation: 39s (bootchart > http://www.harald-hoyer.de/files/f10boot/bootchart-nonread.png) > > After installing readahead and running one collection boot process: 36s > (bootchart http://www.harald-hoyer.de/files/f10boot/bootchart-readahead.png) > > At this point, I recognized that all processes (NetworkManager and newaliases), > which call a fsync(), let the boot process wait until all data is written to > disk. This is the same effect as the firefox sqlite fsync bug > http://shaver.off.net/diary/2008/05/25/fsyncers-and-curveballs/. > > Mounting the root filessystem with relatime and turning off ordered data writing > for the journal with > > # tune2fs -o journal_data_writeback /dev/root > > improved the situation (even though data might be old on the disk after a crash, > but ext3 does not force the disk to empty the write cache anyway). > > Turning off setroubleshoot and fixing > https://bugzilla.redhat.com/show_bug.cgi?id=476023 and > https://bugzilla.redhat.com/show_bug.cgi?id=476028: 32s (bootchart > http://www.harald-hoyer.de/files/f10boot/bootchart-readahead-nosetrouble.png) > > Turning off bootchart: 30s > > So all in all we have nearly accomplished the 30 Second Startup Feature > http://fedoraproject.org/wiki/Features/30SecondStartup. Well, no; not if this requires data=writeback. We can't ship that way, it's a potential security hole. You don't want someone's maildir suddenly containing pieces of /etc/shadow or whatnot. The old data that may be exposed by data=writeback may not belong to that user. -Eric -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
