linux-kernel - Re: [PATCH 3/6] lguest suppress IDE probing

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Date:	Wed, 06 Jun 2007 11:10:58 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bzolnier@...il.com, Matt Mackall <mpm@...enic.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 3/6] lguest suppress IDE probing

On Tue, 2007-06-05 at 17:07 +0100, Alan Cox wrote:
> On Wed, 06 Jun 2007 00:58:03 +1000
> Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> > The IDE probe is the slowest part of boot: by suppressing it we cut
> > boot from from 3 seconds to half a second.
> 
> NAK NAK NAK NAK NAK

Hi Alan!

> > AFAICT, the commandline is the easiest way to suppress the probing.
> 
> Gaa ... Rusty surely you have more taste than that.

Indeed, but it got attention 8)

> See include/asm-foo/ide.h
> 
> Add an lguest check to go with the pci check and for the lguest case just
> say "no controllers"

Actually, Jeremy suggested claiming the entire IO space.  That works for
Xen domU too, and makes some amount of sense.

> Better yet just don't compile in the old IDE stuff, lguest doesn't have a
> PCI or ISA bus anyway.

Sure, but the "run the same kernel as guest and host" is a really nice
feature.

> Alternatively make the IDE I/O space return 0xFF and it'll skip them
> anyway.

Hmm, every "in" should be returning 0xFFs, but I still get the delay and
the probing.  Xen domU gets it too.

Thanks!
Rusty.

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