Date:	Fri, 6 Jun 2008 17:35:35 +0000
From:	Chris Clayton <chris2553@...glemail.com>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org,
	Hannes Reinecke <hare@...e.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2,6.26-rc4-git2 - long pause during boot

On Friday 06 June 2008, James Bottomley wrote:
> On Fri, 2008-06-06 at 06:07 +0000, Chris Clayton wrote:
> > On Friday 06 June 2008, Andrew Morton wrote:
> > > On Sun, 1 Jun 2008 04:15:05 +0000 Chris Clayton
> > > <chris2553@...glemail.com>
> >
> > wrote:
> > > > Hi,
> > > >
> > > > I've just started testing 2.6.26 on my desktop machine and have found
> > > > that I get a long pause (20 seconds or so) as the system boots. By
> > > > pause I mean that the boot messages that normally scroll by stop
> > > > doing so for, as I say, about 20 seconds.
> > > >
> > > > I've done a bisect and arrived at:
> > > >
> > > > b0ed43360fdca227048d88a08290365cb681c1a8 is first bad commit
> > > > commit b0ed43360fdca227048d88a08290365cb681c1a8
> > > > Author: Hannes Reinecke <hare@...e.de>
> > > > Date:   Tue Mar 18 14:32:28 2008 +0100
> > > >
> > > >     [SCSI] add scsi_host and scsi_target to scsi_bus
> > > >
> > > >     This patch implements scsi_host and scsi_target device types
> > > >     and adds both to the scsi_bus.
> > > >
> > > >     Signed-off-by: Hannes Reinecke <hare@...e.de>
> > > >     Signed-off-by: Kay Sievers <kay.sievers@...y.org>
> > > >     Signed-off-by: James Bottomley
> > > > <James.Bottomley@...senPartnership.com>
> > > >
> > > > :040000 040000 4e3140909966b4c9aa987d34ee4078d283fe0351
> > > >
> > > > 46e4fd28cc537ba700eb4f5652abf043fed4d76d M      drivers
> > > >
> > > > The config file for that kernel is attached as are the kernel log for
> > > > booting that kernel and the bisect log.
> > > >
> > > > I've also noticed that it takes much longer for icons to appear on my
> > > > desktop when I plug a usb storage device in. (The icons are
> > > > shown/hidden by a simple sctript that is run via udev when the device
> > > > is
> > > > attached/detached.)
> > >
> > > Do you believe that this is the same period?  20 seconds?
> >
> > Thanks for the reply, Andrew. I was beginning to think that I'd committed
> > an LKML sin :-)
> >
> > Yes, it is about the same. On 2.6.25.4 (and earlier), the icons appear
> > within a second or two, but with 2.6.26-rc2 or later, it takes about 20
> > seconds. I've now built and installed -rc5 and am seeing the same
> > behaviour.
> >
> > I've also built -rc5 on my laptop. On that my kernel uses the older IDE
> > drivers rather than libata. The boot proceeds with no pause, but I do see
> > the same delay in the desktop icons appearing when I attach a usb-storage
> > device.
> >
> > > > Let me know of any way I can help solve this.
> > > >
> > > > Please cc me to any reply as I'm not subscribed.
> > >
> > > cc's added.
> > >
> > > Rafael, we might need to track this as a post-2.6.26 regression.
>
> It already is ... as I asked in the actual bug (but no-one seems to have
> noticed, so I assume the bug entry isn't set up correctly).  Does this
> still persist with 2.6.26-rc5?  The reason for asking is that it looks
> very much like a silent manifestation of our scsi_bus_uevent() problem
> that got fixed in 2.6.26-rc5.
>

Yes, I still get the boot pause and the delay in desktop icons appearing when a 
usb-storage device is plugged in with -rc5. A boot log is attached. Is there 
some sort of verbose scsi boot messaging that I can switch on? I've looked but 
I'm damned if I can find anything in 'make menuconfig'.

Chris

> James



-- 
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