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

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Date:	Thu, 6 Aug 2009 19:15:15 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Al Boldi <a1426z@...ab.com>
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

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.

Kay
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