Messages in this thread | | | Date | Wed, 29 Apr 2009 02:36:39 -0700 (PDT) | From | Martin Knoblauch <> | Subject | Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow |
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------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de
----- Original Message ---- > From: Andrew Morton <akpm@linux-foundation.org> > To: Mike Galbraith <efault@gmx.de> > Cc: Martin Knoblauch <knobi@knobisoft.de>; Rafael J. Wysocki <rjw@sisk.pl>; linux-kernel@vger.kernel.org; tigran aivazian <tigran@aivazian.fsnet.co.uk>; Al Viro <viro@zeniv.linux.org.uk> > Sent: Wednesday, April 29, 2009 10:17:55 AM > Subject: Re: Analyzed/Solved: Booting 2.6.30-rc2-git7 very slow > > On Wed, 29 Apr 2009 05:51:36 +0200 Mike Galbraith wrote: > > > On Tue, 2009-04-28 at 18:28 -0700, Andrew Morton wrote: > > > On Fri, 24 Apr 2009 05:45:19 -0700 (PDT) Martin Knoblauch > wrote: > > > > > > > > > > > > > > > OK, I just found the reason for both intel-ucode and tg3 failures. > Apparently between 2.6.28 and 2.6.29 the mount of sysfs has subtely changed > from: > > > > > > > > /sys /sys sysfs rw 0 0 > > > > > > > > to: > > > > > > > > none /sys sysfs rw,relatime 0 0 > > > > > > I assume that you're referring to the contents of /proc/mounts? > > > > > > > The "none" breaks the RHEL-4 provided hotplug script "firmware.agent" > when it tries to parse the mount point for "/sys". As a result, the firmware > loading is never properly finished and the driver(s) just timeout on the value > in /sys/class/firmware/timeout. Bingo. Simple fix in user-pace possible - cool > down Martin :-) > > > > > > > > Questions remains: was this intentional? It breaks existing userspace and > should therefore be considered a regression - right? On the other hand, it will > never be a problem for RHEL-4/5 kernels, unless the change in 2.6.29 gets > backported. Any ideas? > > > > > > afaik that was unintentional and was probably a mistake. > > > > > > I wonder how we did that. > > > > > > > [hotplug]# grep sysfs /proc/mounts > > > none /sys sysfs rw,relatime 0 0 > > > /sys /sys sysfs rw,relatime 0 0 > > > > ___(I wonder how the heck that is accomplished) > > > > Beats me. I'm not seeing likely changes in fs/proc/base.c or around > show_mountinfo(). Maybe sysfs broke in an ingenious way. (hopefully > cc's viro). > > Displaying relatime seems a bit pointless too.
Actually, relatime is added in 2.6.30. In 2.6.29 I only see the duplicate lines.
Cheers Martin
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