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    SubjectRe: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

    ----- Original Message ----

    > From: Mike Galbraith <efault@gmx.de>
    > To: Martin Knoblauch <knobi@knobisoft.de>
    > Cc: Andrew Morton <akpm@linux-foundation.org>; viro@ZenIV.linux.org.uk; rjw@sisk.pl; linux-kernel@vger.kernel.org; tigran@aivazian.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@vyatta.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@vyatta.com>
    | Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
    | Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

    Cheers
    Martin


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