linux-kernel - Re: [linux-pm] intermittent suspend problem again

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Date:	Wed, 2 Dec 2009 22:33:16 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ferenc Wagner <wferi@...f.hu>
Cc:	linux-pm@...ts.linux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] intermittent suspend problem again

On Wednesday 02 December 2009, Ferenc Wagner wrote:
> Ferenc Wagner <wferi@...f.hu> writes:
> 
> > "Rafael J. Wysocki" <rjw@...k.pl> writes:
> >
> >> On Tuesday 01 December 2009, Ferenc Wagner wrote:
> >>
> >>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> >>> 
> >>>> On Tuesday 01 December 2009, Ferenc Wagner wrote:
> >>>>
> >>>>> "Rafael J. Wysocki" <rjw@...k.pl> writes:
> >>>>>
> >>>>>> In addition to that, you can run multiple hibernation/resume cycles in
> >>>>>> a tight loop using the RTC wakealarm.
> >>>>> 
> >>>>> I'll do so, as soon as I find a way to automatically supply the dm-crypt
> >>>>> passphrase... or even better, learn to hibernate to ramdisk from the
> >>>>> initramfs. :)
> >>>>
> >>>> Well, you don't need to use swap encryption for _testing_. :-)
> >>> 
> >>> I use partition encryption, everything except for /boot is encrypted.
> >>
> >> If /boot is big enough, you could use a swap file in /boot for the testing.
> >
> > Ramdisk worked good.  Maybe too good, because I left the machine doing
> > s2disks while I was having dinner, and it achieved some 120 suspends
> > without a freeze.  Only the e100 and the mii modules were loaded.
> >
> > After some script munging I got the machine automatically boot with an
> > alternate passphrase, so in vivo testing is possible now.  I mean,
> > tomorrow.
> 
> After almost 100 hibernate/resume cycles, I have to say that this issue
> can't be reproduced by suspending in a tight loop.  I tried that while
> flood pinging my gateway and also with no network activity.  The rc8
> e100 module was loaded all the time.

Then I guess we do something that confuses your machine's BIOS or it's a
timing-related issue (ie. there has to be a substantial delay between the
hibernation and restore to trigger the problem).  Or both.

Thanks,
Rafael
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