linux-kernel - Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

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Message-ID: <461911.6351.qm@web32603.mail.mud.yahoo.com>
Date:	Wed, 20 May 2009 03:22:28 -0700 (PDT)
From:	Martin Knoblauch <knobi@...bisoft.de>
To:	Mike Galbraith <efault@....de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, viro@...IV.linux.org.uk,
	rjw@...k.pl, linux-kernel@...r.kernel.org,
	tigran@...azian.fsnet.co.uks, Kay Sievers <kay.sievers@...y.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, shemminger@...tta.com
Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

----- Original Message ----

> From: Mike Galbraith <efault@....de>
> To: Martin Knoblauch <knobi@...bisoft.de>
> Cc: Andrew Morton <akpm@...ux-foundation.org>; viro@...IV.linux.org.uk; rjw@...k.pl; linux-kernel@...r.kernel.org; tigran@...azian.fsnet.co.uk
> Sent: Wednesday, May 6, 2009 10:37:45 AM
> Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow
> 
> On Wed, 2009-05-06 at 00:55 -0700, Martin Knoblauch wrote:
> 
> >  just to bring this back to my problem :-)
> 
> Good idea :-)
> 
> >  Last week I reported that the "new" sysfs entry in /proc/mounts already comes 
> out of initrd. Does this ring a bell?
> > 
> > http://lkml.indiana.edu/hypermail/linux/kernel/0904.3/03048.html
> 
> Nope, no bells.
> 
> The only thing I can suggest is that you try a bisection.
> 
>     -Mike

 OK, so I finally managed to bisect the issue down to the following commit. Not much that I can say about it. Someone else suggested that it might all be a question of timing. Might very well be. I will try it out on a system with a different SCSI/RAID controller. The failing system has an "Smart Array 6i" (cciss). "cciss", "ext3" and "jbd" are all modules coming from initrd.

|commit 1120f8b8169fb2cb51219d326892d963e762edb6
|Author: Stephen Hemminger <shemminger@...tta.com>
|Date:   Thu Dec 18 09:17:16 2008 -0800
|
|    PCI: handle long delays in VPD access
|
|    Accessing the VPD area can take a long time.  The existing
|    VPD access code fails consistently on my hardware. There are comments
|
|    Change the access routines to:
|      * use a mutex rather than spinning with IRQ's disabled and lock held
|      * have a much longer timeout
|      * call cond_resched while spinning
|
|    Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
|    Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>
|    Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>

Cheers
Martin
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