Date: Wed, 29 Sep 2004 16:53:53 -0700
From: Greg KH <greg@kroah.com>
To: "Randy.Dunlap" <rddunlap@osdl.org>
Cc: patrakov@ums.usu.ru, linux-kernel@vger.kernel.org
Subject: Re: udev is too slow creating devices
Message-ID: <20040929235353.GA27192@kroah.com>
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On Wed, Sep 29, 2004 at 04:38:28PM -0700, Randy.Dunlap wrote:
> On Sun, 19 Sep 2004 10:30:35 -0700 Greg KH wrote:
> 
> | On Sun, Sep 19, 2004 at 10:00:52PM +0600, Alexander E. Patrakov wrote:
> | > 
> | > OK. The fact is that, when mounting the root filesystem, the kernel can 
> | > (?) definitely say "there is no such device, and it's useless to wait 
> | > for it--so I panic". Is it possible to duplicate this logic in the case 
> | > with udev and modprobe? If so, it should be built into a common place 
> | > (either the kernel or into modprobe), but not into all apps.
> | 
> | No, we need to just change the kernel to sit and spin for a while if the
> | root partition is not found.  This is the main problem right now for
> | booting off of a USB device (or any other "slow" to discover device.)
> | It's a known kernel issue, and there are patches for 2.4 for this, but
> | no one has taken the time to update them for 2.6.
> 
> (I'm way behind, and I was hoping this thread would die, but:)
> 
> I've seen 2.6 patches for booting from USB or IEEE1394.

Where?

> Is there a fair chance of getting something for USB/1394 booting
> merged?  (other than by using initrd)

I want to see this work, as lots of people bug me about this when I meet
them with the comment, "Oh, you're the USB maintainer, how come I can't
boot off of my USB flash key," which causes me to turn and run away very
fast...

thanks,

greg k-h
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