linux-kernel - Re: APIC frequency too slow on HP dv5z

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Date:	Thu, 2 Oct 2008 11:13:26 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Howard Chu <hyc@...as.com>
cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: APIC frequency too slow on HP dv5z

On Thu, 2 Oct 2008, Howard Chu wrote:
> Thomas Gleixner wrote:
> > On Tue, 30 Sep 2008, Howard Chu wrote:
> > 
> > > More often than not, on a warm boot I see something like this
> > > 
> > > msg.new:[    1.940031] Using local APIC timer interrupts.
> > > msg.new:[    1.944031] APIC timer calibration result 466046
> > > msg.new:[    1.944031] Detected 0.466 MHz APIC timer.
> > > msg.new:[    1.944031] APIC frequency too slow, disabling apic timer
> > > 
> > > On cold boots it may see 12.5MHz, or may not...
> > > 
> > > [    2.000584] Using local APIC timer interrupts.
> > > [    2.004067] APIC timer calibration result 12500236
> > > [    2.004080] Detected 12.500 MHz APIC timer.
> > > 
> > > I haven't figured out yet what the pattern is behind the behavior. Has
> > > anyone
> > > else seen this kind of problem before?
> > 
> > Hmm, strange. Which kernel version ?
> 
> I only started paying attention recently. 2.6.27-rc4 thru rc7 for sure. I'm
> running rc7 right now, that's what those log snippets are from.

Ok. Can you please add apic=verbose to the kernel command line so we
get more detailed info about that ?

Thanks,

	tglx
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