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

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Date:	Wed, 4 May 2011 10:37:37 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Christian Hoffmann <email@...istianhoffmann.info>
cc:	john stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Long timeout when booting >= 2.6.38

On Wed, 4 May 2011, Christian Hoffmann wrote:

> In fact, switching to acpi_pm doesn't seem to work:
> 
> $ dmesg | grep clock
> 
> [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-2.6.39-rc5-ch-broken+
> 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-broken+
> root=/dev/mapper/vg-root ro quiet splash vt.handoff=7 clocksource=acpi_pm
> [    0.000000] hpet clockevent registered
> [    1.413835] Switching to clocksource hpet
> [    1.420762] Override clocksource acpi_pm is not HRT compatible. Cannot
> switch while in HRT/NOHZ mode

Huch. There is something badly wrong. Can you provide the output of

 cat /sys/devices/system/clocksource/clocksource0/available_clocksource

please ?

> [  147.940143] Refined TSC clocksource calibration: 2809.409 MHz.
> [  147.940147] Switching to clocksource tsc

I just looked at the two boot logs you provided. So the main
difference is that TSC gets installed way later.

Can you please boot the "working" kernel with clocksource=hpet on the
commandline and verify whether the boot hang appears there as well?

Thanks,

	tglx
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