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

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Date:	Thu, 6 Aug 2009 20:27:09 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Greg KH <greg@...ah.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.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

Kay Sievers wrote:
> On Thu, Aug 6, 2009 at 19:06, Al Boldi<a1426z@...ab.com> 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,
>
> Because you setup is broken, I guess.
>
> > 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.
>
> It takes more like 0.5 - 0.7 seconds on a usual setup.

I don't know about your setup, but all dists I used (fedora, mandriva, ubuntu, 
debian) hang every boot for 5-10s.

Are you saying devtmpfs has the same delay as udev?

Thanks!

--
Al

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