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

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Message-ID: <alpine.LFD.1.10.0810021052410.5549@apollo.tec.linutronix.de>
Date:	Thu, 2 Oct 2008 10:53:22 +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 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 ? 

Thanks,

	tglx
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