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

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Date:	Wed, 02 Dec 2009 11:55:07 +0100
From:	Ferenc Wagner <wferi@...f.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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

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.

> Btw. s2disk has a strange effect of simulating enters during suspend.
> [...]
> Can you also see this?

It can't be seen from the "sleep 1; s2disk" command, so it's probably an
artifact from X, when s2disk starts before Enter is released.
-- 
Regards,
Feri.
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