linux-kernel - Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev

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Date:	Thu, 6 Aug 2009 11:36:53 -0700
From:	Greg KH <greg@...ah.com>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>,
	Jan Blunck <jblunck@...e.de>, gregkh@...e.de,
	Harald Hoyer <harald@...hat.com>,
	Scott James Remnant <scott@...ntu.com>
Subject: Re: [PATCH] Driver Core: devtmpfs - kernel-maintained tmpfs-based
 /dev

On Thu, Aug 06, 2009 at 08:06:16PM +0300, Al Boldi wrote:
> Andi Kleen wrote:
> > Greg KH <greg@...ah.com> writes:
> > > It makes the userspace boot process much simpler and easier to maintain,
> > > as well as providing a way to handle rescue disks and images trivially,
> > > and it makes the kernel _less_ dependant on the early userspace bootup
> > > scripts.
> >
> > As a initrd less kernel user I can really only agree: getting rid
> > of the udev-in-initrd requirement would be a big step forward
> > in usability. Typically I always have to pre populate
> > a on disk /dev manually first to get my kernels to boot.
> 
> Oh good, I thought I was the only one doing that.
> 
> The reason I don't like udev is that it's just to slow; something like a 5-10s 
> delay on each boot.  No idea why it should be so slow, but it's probably 
> probing the kernel for all available devices at boot, when it could be much 
> quicker by probing for the device on access.

Like Kay stated, this sounds like a misconfiguration of your distro's
udev setup, as the ones I use (openSUSE and Gentoo) do not have this
problem at all.

Please work with your distro and the people on the
linux-hotplug@...r.kernel.org mailing list to help resolve this issue.

thanks,

greg k-h
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