Subject: Re: 2,6.26-rc4-git2 - long pause during boot
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: chris2553@googlemail.com
Cc: Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, linux-scsi@vger.kernel.org,
       Hannes Reinecke <hare@suse.de>, "Rafael J. Wysocki" <rjw@sisk.pl>
In-Reply-To: <200806060607.29460.chris2553@googlemail.com>
References: <200806010415.05290.chris2553@googlemail.com>
	 <20080605221709.f248eb90.akpm@linux-foundation.org>
	 <200806060607.29460.chris2553@googlemail.com>
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Date: Fri, 06 Jun 2008 09:11:25 -0500
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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@googlemail.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@suse.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@suse.de>
> > >     Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
> > >     Signed-off-by: James Bottomley
> > > <James.Bottomley@HansenPartnership.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.

James


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