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

Peeters Simon peeters.simon at gmail.com
Mon Jun 4 15:05:18 PDT 2012


2012/6/4 Kok, Auke-jan H <auke-jan.h.kok at intel.com>:
> On Mon, Jun 4, 2012 at 1:48 PM, Peeters Simon <peeters.simon at gmail.com> wrote:
>> actually, here it is (forgotten attachment)
>
>
> Could you recreate the bootchart, but this time, boot with
> "initcall_debug=1" on the kernel commandline as well?
>
> This may provide some hints why your system is taking very long to
> start doing readahead.
>
> You'll want to disable the bootchart collector stuff (well, all of it)
> for the fedora bootchart package - better to uninstall it entirely.
>
> You might want to disable vconsole-setup if you never work on the
> console, and don't need fancy fonts and keyboard setups on the
> console.
>
> Other than that, I can see mounting takes a bit (2-3 secs) which is
> indicative of your hard disk speed.

it is just a 2.5" laptop disk, so i don't expect a lot, but the heavy
seek, not doing much thingy bothered me
(also, the disk gets up to 60MB/s in a straigt line)

> Try removing the /.readahead file and rebooting twice before
> generating another bootchart.
>

new bootchart after doing all the above is attached
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