linux-kernel - Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

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Date:	Wed, 30 May 2007 08:43:47 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Romano Giannetti <romanol@...omillas.es>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Pavel Machek <pavel@....cz>,
	Chris Wright <chrisw@...s-sol.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org, Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: pcmcia resume 60 second hang. Re: [patch 00/69] -stable review

On Wed, 30 May 2007 12:26:57 +0200 Romano Giannetti wrote:

> 
> On Tue, 2007-05-29 at 07:55 -0700, Linus Torvalds wrote:
> > 
> > On Tue, 29 May 2007, Romano Giannetti wrote:
> > >
> > > - The good (?) news. I have made 7 suspend/resume cycle (to ram, I
> > > haven't tested hibernation) with a 2.6.21.2 with that patch, applied
> > > manually. The system did suspend and resume nicely even compiling a
> > > kernel and opening openoffice. Normally (le me stress _normally_) no
> > > delay was apparent on resume. I do not know how dangerous is this... :-)
> > > 
> > > - The bad (?) news. One time out of 7 I had the 60 seconds delay.
> > 
> > Interesting. If you can re-create it, please do the sysrq-T thing again, 
> > to see what's up. (Also, you might do "sysrq-p", which gives the current 
> > process data, which sysrq-T does not).
> 
> 
> I've got it, but I had a problem: I filled the dmesg buffer. I will try
> to find where to enlarge it. I have posted the partial result to: 

use 'dmesg -s 100000' if it's just dmesg(8) that needs help.
If it's the kernel buffer filling up, you can rebuild the kernel
after changing CONFIG_LOG_BUF_SHIFT, but it's easier just to boot
using this:
	log_buf_len=n	Sets the size of the printk ring buffer, in bytes.
			Format: { n | nk | nM }
			n must be a power of two.  The default size
			is set in the kernel config file.

---
~Randy
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