linux-kernel - Re: Clocksource tsc is always unstable with 2.6.25-* kernels and CONFIG_NO

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Message-ID: <alpine.LFD.1.00.0802250839240.7583@apollo.tec.linutronix.de>
Date:	Mon, 25 Feb 2008 08:40:52 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Robert Hancock <hancockr@...w.ca>
cc:	Gabriel C <nix.or.die@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Gabriel C <crazy@...galware.org>
Subject: Re: Clocksource tsc is always unstable with 2.6.25-* kernels and
 CONFIG_NO_HZ=y on my box

On Sun, 24 Feb 2008, Robert Hancock wrote:
> Gabriel C wrote:
> > Hi,
> > 
> > I noticed tsc is always marked unstable on my box with 2.6.25* , 2.6.24 is
> > fine.
> > 
> > ..
> > 
> > [    0.825760] ACPI: PCI Interrupt 0000:03:0e.0[A] -> GSI 22 (level, low) ->
> > IRQ 22
> > [    0.805755] Switched to high resolution mode on CPU 1
> > [    0.794244] Switched to high resolution mode on CPU 2
> > [    0.766968] Switched to high resolution mode on CPU 3
> > [    1.083944] Switched to high resolution mode on CPU 0
> > [   15.388792] Clocksource tsc unstable (delta = 9373391604 ns)

Doh, this looks like the acpi_pm timer is not working at all.

> > [   15.714648] Time: acpi_pm clocksource has been installed.
> > ..
> > 
> > Booting nohz=off fixes that.
> > 
> > Another strange thing is when I try to boot that kernel with
> > clocksource=acpi_pm it just hangs.

Which confirms the above.
 
> > config is attached.
> > 
> > Please let me know if you need more infos / want me to try patches or
> > anything else.
> 
> Please post your full dmesg output.

Yes please.

Thanks,
	tglx
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