linux-kernel - Re: udev taking a long time during startup

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Message-ID: <20060802033741.GA24880@kroah.com>
Date:	Tue, 1 Aug 2006 20:37:41 -0700
From:	Greg KH <greg@...ah.com>
To:	Piet Delaney <piet@...elane.com>
Cc:	linux-kernel@...r.kernel.org, piet at work <piet@...k.piet.net>
Subject: Re: udev taking a long time during startup

On Tue, Aug 01, 2006 at 12:16:25AM -0700, Piet Delaney wrote:
> Hey Gang:
> 
> We were wondering why there is a 60 second delay on our systems
> from the time that the kernel releases memory and the file system 
> is checked.
> 
> I dropped into kgdb during this period and found that an init
> script, S10udev in our case, was sleeping in sys_nanosleep()
> or sys_wait4(). Looks like thread/process S10udev forks udevstart
> which forks udev which appears to be sleeping or waiting every time
> I check in on it; Seems terribly wasteful.

You don't let us know what kernel version, or what version of udev, or
even what distro you are using.  I think we need a bit more information
here :)

> udev seems to be a utility for hotplug and configured
> with /etc/udev/udev.conf. Since we have no hot plug devices
> I wonder if it really has to be called on every startup. On
> solaris the device nodes are only re-established if you boot
> with a -r option.

Yes, udev figures out what device nodes to create at boot time, it is
required if you want to use it.

thanks,

greg k-h
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