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

[Kok, Auke-jan H]

On Mon, Jun 4, 2012 at 4:36 PM, Peeters Simon <peeters.simon at gmail.com> wrote:
> 2012/6/4 Kok, Auke-jan H <auke-jan.h.kok at intel.com>:
>> It seems your system is taking well into 15+ seconds before btrfs is
>> actually *ready* on your system, which seems to be the main hiccup
>> (note, speculation here). I've personally become a bit displeased with
>> btrfs performance recently myself, so, I'm wondering if you should try
>> ext4 for now.
>
> i doubt it is btrfs since this is only my home partition, which is
> automounted (the reason why it get activated so late).
>
> i now disabled my home partition (so booting up 100% ext4) and i still
> see the same "udev doing stuff" hole in the bootchart (both low I/O
> and low CPU here)
>
>> Other than that, after btrfs/udev finally pops to life, things seem to
>> start relatively quickly.
>
> well, you name the two here, but i am pretty convinced it is not btrfs
> so it seems to be udev.

ah, I didn't spot the automount.

What filesystem is your rootfs on?

Auke