2012/6/4 Kok, Auke-jan H <[email protected]>: > 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.
well, here it is, it does not really show the I/O activity the old one shows (it seems like this one only shows throughput) between 9 and 15 seconds almost nothing seems to happen, almost no cpu, almost no I/O throughput, only the sound of my harddisk seeking the whole time, could it be because udev spawns so many children that want access to the disk simultaneously? simon _______________________________________________ systemd-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/systemd-devel
