udevstart surprisingly slow

udevstart surprisingly slow

[iSteve]

Greetings,
I've recently upgraded udev from 063 to 082 and then 084.

With 063, startup of udev was near-instant; with both 082 and 084, it 
takes a significant ammount of time (~15s) to create the base devices 
using udevstart or udevsynthesize (this one is taken from Debian, which 
apparently in turn taken it from SuSE; the rest of codebase is vanilla).

This issue appears on kernel 2.6.15.1 with SquashFS 2.2r2, SWSUP2 2.2 
and VesaFB-TNG 1.0-rc1-r3 patches.

The init script used simply mounts 10MiB tmpfs onto /dev, creates 
/dev/.udev/{db,queue} directories, then runs udevd --daemon and then 
udevsynthesize or udevstart (tried both, same result).

I'm quite out of ideas, I don't think downgrading udev is the best 
solution, so I wonder: what takes such a long time in udevstart? What 
can I alter at my end, or is this a known bug (or feature)?

Thanks in advance for reply
  -- iSteve

Re: udevstart surprisingly slow

[Greg KH]

On Mon, Jan 30, 2006 at 11:04:14PM +0100, iSteve wrote:
> Greetings,
> I've recently upgraded udev from 063 to 082 and then 084.
> 
> With 063, startup of udev was near-instant; with both 082 and 084, it 
> takes a significant ammount of time (~15s) to create the base devices 
> using udevstart or udevsynthesize (this one is taken from Debian, which 
> apparently in turn taken it from SuSE; the rest of codebase is vanilla).

With the 2.6.15 kernel, udevstart is no longer needed.  Please use the
recommended shell script instead (as posted to the linux-hotplug-devel
mailing list.)

> This issue appears on kernel 2.6.15.1 with SquashFS 2.2r2, SWSUP2 2.2 
> and VesaFB-TNG 1.0-rc1-r3 patches.

All of which are not patches included in the mainline kernel.  Can you
try it without these?

> The init script used simply mounts 10MiB tmpfs onto /dev, creates 
> /dev/.udev/{db,queue} directories, then runs udevd --daemon and then 
> udevsynthesize or udevstart (tried both, same result).

Again, don't do that :)

Also, udev specific questions like these are best asked on the
linux-hotplug-devel mailing list, as the udev documentation states.

thanks,

greg k-h