From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755004AbZETLBr (ORCPT ); Wed, 20 May 2009 07:01:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752811AbZETLBk (ORCPT ); Wed, 20 May 2009 07:01:40 -0400 Received: from web32606.mail.mud.yahoo.com ([68.142.207.233]:35413 "HELO web32606.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751126AbZETLBj (ORCPT ); Wed, 20 May 2009 07:01:39 -0400 Message-ID: <678884.67843.qm@web32606.mail.mud.yahoo.com> X-YMail-OSG: 1nYwXmUVM1kHLWqGKn2axA6m5wy7lYt9tS7xHjkT_XChdTDcngulgzqrNrf7G7zUoHO5.Pi0N8HGWF.1VGmoslPoAdfW3hDYacT3poq3qtHgr5tD5ydNCbs3oe56YUNypm4Nn3GlZxrydfA.UOgB_8s9rh0ZgnqrfOkgAP4PbsyXU5XHLfCwTxoPuIQ6wqJpY9Kf60AqGMX_9tP3cIhUb8rXuhN5O.iT X-RocketYMMF: knobi.rm X-Mailer: YahooMailRC/1277.43 YahooMailWebService/0.7.289.10 Date: Wed, 20 May 2009 04:01:40 -0700 (PDT) From: Martin Knoblauch Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow To: Mike Galbraith Cc: Andrew Morton , viro@ZenIV.linux.org.uk, rjw@sisk.pl, linux-kernel@vger.kernel.org, tigran@aivazian.fsnet.co.uks, Kay Sievers , "Rafael J. Wysocki" , shemminger@vyatta.com MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- Original Message ---- > From: Martin Knoblauch > To: Mike Galbraith > Cc: Andrew Morton ; viro@ZenIV.linux.org.uk; rjw@sisk.pl; linux-kernel@vger.kernel.org; tigran@aivazian.fsnet.co.uks; Kay Sievers ; Rafael J. Wysocki ; shemminger@vyatta.com > Sent: Wednesday, May 20, 2009 12:22:28 PM > Subject: Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow > > ----- Original Message ---- > > > From: Mike Galbraith > > To: Martin Knoblauch > > Cc: Andrew Morton ; 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 > |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 > | Reviewed-by: Matthew Wilcox > | Signed-off-by: Jesse Barnes > yup. Different hardware (IBM x3650 with aacraid) does not show the problem. So it seems to be timing related. I more and more tend to view this as "so what" and go along. Cheers Martin