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

[Peeters Simon]

2012/6/4 Kok, Auke-jan H <auke-jan.h.kok at intel.com>:
> 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
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.)

>
> Auke
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