linux-kernel - Re: Long delays and keystrokes required

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Message-ID: <4907D957.6040206@linux.intel.com>
Date:	Tue, 28 Oct 2008 20:32:39 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Frans Pop <elendil@...net.nl>
CC:	linux-kernel@...r.kernel.org,
	Yves-Alexis Perez <corsac@...ian.org>,
	"Carlos R. Mafra" <crmafra2@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Long delays and keystrokes required - related to disk encryption?

Frans Pop wrote:
> On Tuesday 28 October 2008, Frans Pop wrote:
>> I'm seeing some very strange behavior with 2.6.28-rc2-95-g49fdf67 on my
>> HP 2510p notebook.
>>
>> During the boot there are several places where I need to hit a key for
>> the boot to continue. There are also some very long delays before the
>> next syslog message is displayed.
>> The boot does continue and regularly hitting a key helps (but does not
>> get rid of all delays), but it is a huge regression from 2.6.27.
>>
>> The delays seem to continue until file systems get mounted.
>>
>> As the delays start at the point my system asks for the passphrase to
>> unlock (LUKS) encrypted disks, I suspect it has to do with that.
>> Especially since hitting a key seems to "trigger" new disk activity.
>>
>> However, the delays happen _again_ during shutdown, which makes it
>> extra strange that the system does behave normally when logged in.
>>
>> During the first boot wireless networking failed. During the second
>> boot, wireless networking did come up (without any relevant changes).
>> This gave an interesting extra data point: with wireless the delays on
>> shutdown started later: after iwlagn gets disabled.
> 
> I've bisected it to:
> commit dc4304f7deee29fcdf6a2b62f7146ea7f505fd42
> Author: Arjan van de Ven <arjan@...ux.intel.com>
> Date:   Mon Oct 13 10:32:15 2008 -0400
>     rangetimers: fix the bug reported by Ingo for real
> 
> The bisection was one of those annoying ones where you switch branches
> often and get a load of config changes. This means that I'm not 100% sure
> about it, especially as the behavior changed for the last few "bad"s:
> instead of endlessly repeated delays there would be only a few of them
> immediately after entering the LUKS passphrase.

ok one easy thing to try, in the peek function (that this patch touches),
just stick a "return" as first statement in.
If that "fixes" it, we have a real issue with hrtimers, if not then something else is going on..

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