On Mon, Jun 4, 2012 at 1:14 PM, Peeters Simon <[email protected]> wrote: > 2012/6/4 Kok, Auke-jan H <[email protected]>: >> On Mon, Jun 4, 2012 at 12:49 PM, Peeters Simon <[email protected]> >> wrote: >>> Hello all. >>> >>> while trying to optimize my bootup i noted that i could not squeeze it >>> under 17seconds userspace >>> >>> Looking at the bootchart revealed that this is mainly due to >>> systemd-udevd consuming 60% of my bootup I/O. >>> This means i lose 12 seconds of bootup just to one process. >> >> can you post the bootchart SVG file? >> >> I'm assuming you're using this version of bootchart: >> >> http://foo-projects.org/~sofar/bootchart/bootchart-1.18.tar.gz > apparently not, i did just yum install bootchart and it reports to be > version 0.14, will take a look at this version. >> >>> i was wondering whether there is any way to get this more optimized? >>> fewer udev rules? more readahead? something else? (i have no idea what >>> this I/O is, except for the fact that it is scattered all over the >>> place) >>> >>> this was with systemd 184(from fedora18) on fedora 17. >> >> The bootchart SVG will tell us most of the stuff that want to know - >> so please share it. > here you are (this is with fedoras default bootchart, will try the > other one later.)
the old version obscures a lot of information - in this case all the IO gets attributed to udev while in fact it's probably one of your kernel threads. The version of bootchart I maintain should provide a much clearer picture of where the bottlenecks are. Auke _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
