linux-kernel - Re: Long timeout when booting >= 2.6.38

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Message-ID: <4DC1AB9B.8080501@christianhoffmann.info>
Date:	Wed, 04 May 2011 21:40:11 +0200
From:	Christian Hoffmann <email@...istianhoffmann.info>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	john stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Long timeout when booting >= 2.6.38

>
> Hmm. So I really wonder why it refuses to switch to acpi_pm when you
> select it on the kernel command line.
>
> Does "echo acpi_pm>  /sys/devices/system/clocksource/clocksource0/current_clocksource"
> work ?

Yes, that seems to work:

root@...o:~# echo acpi_pm > 
/sys/devices/system/clocksource/clocksource0/current_clocksource
root@...o:~# dmesg | grep clocksource
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch+ 
root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
[    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch+ 
root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
[    1.463754] Switching to clocksource tsc
[    1.470700] Override clocksource acpi_pm is not HRT compatible. 
Cannot switch while in HRT/NOHZ mode
[  125.808622] Switching to clocksource acpi_pm

>
> Ok. That excludes HPET. So the only difference left is the late
> registration of TSC which happens _AFTER_ the hang.
>
> Can you boot the non working kernel with "lpj=28098860" on the kernel
> command line ?

The dmesg output with lpj is here (and it still hangs):

http://pastebin.com/raw.php?i=wZWrbc7Z

Kind regards,

Chris
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