[systemd-devel] systemd-udevd: excessive I/O usage

[Kok, Auke-jan H]

On Mon, Jun 4, 2012 at 12:49 PM, Peeters Simon <peeters.simon at gmail.com> 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

> 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.

Auke