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

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Message-ID: <alpine.LFD.2.02.1105041931510.3005@ionos>
Date:	Wed, 4 May 2011 19:49:17 +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:
> Hi,
> 
> > Huch. There is something badly wrong. Can you provide the output of
> > 
> >   cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> > 
> > please ?
> 
> $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource
> tsc hpet acpi_pm

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 ?

> > > [  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?
> > 
> 
> No, it works fine. See http://pastebin.com/raw.php?i=4wJWkiNM.

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 ?

Thanks,

	tglx
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