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

Martin Knoblauch
2009-06-21T10:54:29Z

----- Original Message ----

> From: jim owens <jowens@hp.com>
> To: Martin Knoblauch <knobi@knobisoft.de>
> Cc: Jesse Barnes <jbarnes@virtuousgeek.org>; Kay Sievers <kay.sievers@vrfy.org>; Andrew Morton <akpm@linux-foundation.org>; efault@gmx.de; viro@zeniv.linux.org.uk; rjw@sisk.pl; linux-kernel@vger.kernel.org; shemminger@vyatta.com; matthew@wil.cx; mike.miller@hp.com
> Sent: Saturday, June 20, 2009 6:37:34 PM
> Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow
>
> Martin Knoblauch wrote:
> > ----- Original Message ----
> >
> >> From: Jesse Barnes
> >> To: Martin Knoblauch
> >> Cc: Kay Sievers ; Andrew Morton
> ; efault@gmx.de; viro@zeniv.linux.org.uk;
> rjw@sisk.pl; linux-kernel@vger.kernel.org; shemminger@vyatta.com;
> matthew@wil.cx; mike.miller@hp.com
> >> Sent: Tuesday, June 16, 2009 9:25:47 PM
> >> Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow
> >>
> >> On Thu, 28 May 2009 02:14:46 -0700 (PDT)
> >> Martin Knoblauch wrote:
> >>>> I expect the duplicate comes from a left-over mount in initramfs
> >>>> which isn't a duplicate in the sense of a bug in vfs or mount or
> >>>> anything. I guess, it is just still mounted in the initial kernel
> >>>> rootfs, below the root from the disk. It could be that a umount
> >>>> from initramfs did go wrong because of a changed timing.
> >>>>
> >>> This is what I suspect as well. I know for sure that the first
> >>> sysfs-line in /proc/mounts
> >>>
> >>> | none /sys sysfs rw 0 0
> >>>
> >>> is already there (2.6.29-rc1 and up) when entering startup-skripts.
> >>> It is supposed to be unmounted before, but something seems to prevent
> >>> it. I have idea how to capture debug output from the initrd/init
> >>> script :-(
> >> What's the latest here Martin? It sounded like this was a userspace
> >> issue, with something reading the VPD over and over? Or was it just a
> >> longer timeout that caused a specific driver to slow everything down?
> >>
> >
> > Not sure about the VPD thing. Anyway, no real news. Still happens in 2.6.30.
> But it only happens on a certain HW platform (HP/DL380G4). The folks at HP try
> to reproduce in their environment.
> >
> > Cheers
> > Martin
>
> I reproduced this and verified Martin's analysis. Conclusions:
>

Cool, so I am not seeing gremlins :-)

Cheers
Martin